pen laser pointer,laser pointer

However, in order to achieve the size, shape processing, but also must have the following specific conditions: anode of the workpiece and the tool cathode (mostly forming tools cathode) to maintain a small gap (known as the machining gap), generally in the range of 0.1-1mm. Electrolyte from continuous high-speed machining gap (6-30m / s) flow through to take away the heat generated by the product of the anodic dissolution and electrolytic current through the electrolyte, and depolarization. Workpiece the anode and the tool cathode and DC power supply (typically 10-24V) connection, the above two conditions, the high current density of bipolar processing gap, up to 10-100A/cm2 orders of magnitude. Conductive grinding (also known as electrolytic grinding).    green laser pointer      performs stable.
The combination of electrolysis and mechanical grinding process. Conductive grinding, the workpiece is connected to the anode of the DC power supply conductive grinding wheel is connected to the cathode, both to maintain a certain contact pressure, and the introduction of the electrolyte processing zones. When powered on, the metal surface of the workpiece anodic dissolution and the formation of a thin oxide film, its hardness is much lower than the workpiece, high-speed rotating grinding wheel abrasive scrape, then form a new oxide film has been wheel rubbed off. So, until it reaches the processing requirements so far.   green lase pointer has become the light spot of various parties or locations.
The electrochemical polishing (also known as electropolishing). Direct application of the electrochemical reaction of anodic dissolution of machining parts for further processing in order to improve workpiece surface finish.. Electropolishing higher than the efficiency of mechanical polishing, high precision, and not affected by the hardness and toughness of the material, the trend to gradually replace mechanical polishing. Electropolishing the basic principles of electrochemical machining, electropolishing cathode is fixed, distances between electrodes (1.5 to 200 mm), remove the metal less. Electropolishing to control the appropriate current density. Produce corrosion current density is too metal surface, and the production efficiency is low; hydroxide ions or oxygen anion discharge phenomenon occurs when the current density is too large, and gaseous oxygen precipitation, which reduces the current efficiency. Here is the general introduction to    green laser pointer     .
With the electrolytic plating method of metal deposition on the conductor (eg metal) or non-conductor surface (such as plastics, ceramics, glass, steel, etc.), in order to improve the wear resistance, increasing its electrical conductivity, and it has anti-corrosion and decorative features. The surface of the non-conductor products, subject to proper handling (graphite, conductive paint, chemical plating, or coating by gas processing), to form a conductive layer can be plated. Plating, plating of products connected to the cathode on the metal to be plated is connected to the anode. Electrolyte solution containing the same ions of the anode metal. Power, the anode gradually dissolved into the metal positive ions in solution, an equal number of metal ions on the cathode electron then precipitated on the surface of the plated products, the formation of the metal coating.  laser pointer pen can show office files via the projector.
Such as nickel, copper plating solution containing nickel sulfate in aqueous solution. Energized, the nickel anode gradually dissolved into a positive ion, the precipitation of nickel on the copper surface of the cathode. The laser processing is the most common application of laser systems. According to the mechanism of the laser beam interaction with the material, the laser processing can be roughly divided into two types of laser thermal processing and photochemical reaction processing. Laser thermal processing refers to the use of the thermal effects generated by the laser beam is projected onto the surface to complete the processing, including laser welding, laser cutting, surface modification, laser marking, laser drilling and micromachining. The shooting distance of green ray    green laser pointer      is 39 times higher than that of the yellow ray    green laser pointer     .

Difficult to machine materials such as titanium, stainless steel heat-resistant, high strength steel, composites, engineering ceramics, diamond, ruby, hardened glass, high-hardness, high toughness, high strength, high melting point materials. Difficult to machine parts, such as three-dimensional cavity of complex parts, type Kong, the group of holes and slit such as processing. Low stiffness parts, processing parts such as thin-walled parts, the elastic element. High energy density beam welding, cutting, system holes, spraying, surface modification, etching, and fine processing. EDM is immersed in the working fluid in the pulse discharge between the poles of the electric erosion corrosion in addition to the special processing method of the conductive material, also known as electrical discharge machining or electrical erosion processing. Battery of    green laser pointer      is the chargeable battery.
Electrical discharge machining speed and surface quality. Mold in EDM machining is generally coarse, fine sub-file processing methods. Roughing using high-power, low loss, finishing electrode relative loss, but under normal circumstances, less precision machining allowance, electrode wear is minimal, can compensate for size control through processing, or does not affect the accuracy requirements to be ignored. EDM carbon residue and slag. EDM machining conditions to produce carbon residue and remove the balance of carbon residue can proceed smoothly. Practice, often at the expense of processing speed to exclude carbon residue, for example, finishing with high voltage, large telogen pulse and so on.   green lase pointer shows the bright picture, wonderful change and tremendous content.
Another effect of the exclusion of carbon residue is a complex shape of the machined surface, so that the chip removal path is not smooth. Only positive to create good conditions to exclude, to take some method to actively symptomatic. EDM workpiece and the electrode loss. EDM machine discharge pulse for a long time, help to reduce the electrode wear. EDM machine roughing generally use long discharge pulse and high-current discharge, processing speed, small electrode wear. In finishing the small discharge current must reduce the discharge pulse, which not only increases the electrode wear, but also significantly reduce the processing speed. In accordance with the characteristics of relative motion in the form of the tool electrode and workpiece, the EDM approach can be divided into five categories.    green laser pointer      has been becoming popular since they first appeared on the market.
Molding tool electrode relative to the workpiece for simple feed motion of the electric spark forming; axial movement of the wire tool electrode and workpiece trajectory according to the required shape and size, EDM wire cutting to cutting the conductive material ; the use of metal wire or forming the conductive grinding wheel for tool electrode holes grinding or forming grinding EDG; for processing thread ring gage, thread plug gauge, gear and spark conjugate rotation processing; holes processing, graphic, surface alloying, surface hardening, and other types of processing. Electrochemical reaction (or electrochemical corrosion) of metallic materials processing methods. Compared to machining.  laser pointer pen is equipped with a SC-PC.
Electrochemical machining is not the limit of the material hardness, toughness, has been widely used in industrial production. Commonly used in electrochemical machining electrochemical machining, grinding power, electrochemical polishing, electroplating, electric etching and electrolytic smelting and so on. Electrochemical machining, grinding conductive (also known as electrolysis grinding), electrochemical polishing (also known as electropolishing), electroplating, electric etching (also known as electrolytic etching), the electrolytic smelting. Based on the principle of the anodic dissolution in the electrolytic process by means of forming the cathode, forming a workpiece by a certain shape and size of processing technologies and methods, known as electrochemical machining. Processing system as shown.    green laser pointer      can make the demonstrators feel easy.

Compression wave shock effects such as target material vaporized target material produce recoil effect in a very short period of time, the formation of surface spall broken open, and debris to fly out and cause further damage to the radiation effects of the target material gasification will also form a plasma cloud, which can produce ultraviolet radiation and X-ray, so that the target within the electronic components to be destroyed. The advantages of laser weapons: no ballistic calculation; recoilless; easy to operate, flexible, a wide range of use; no radioactive contamination, cost effective. Laser range finder is the starting point of the laser applications in the military, and its application to artillery systems, greatly improving the accuracy of artillery fire. The laser radar compared to the radio radar.   green lase pointer is very important in business contact and so on.
Laser divergence angle is small, directional, so the measurement accuracy is greatly improved: for the same reason, the laser radar blind spots, especially suitable for tracking and measuring the initial stage of the missile. There is also a precision laser-guided weapons, blinding laser weapons, they play in the modern high-tech war and its important role. In addition, the laser technology is also widely used in agriculture, communications, computers, space technology and other fields. Increasingly wide range of global industry recognized as the fastest growing, the application of the most important high-tech photovoltaic technology, he will become the pillar industry of the 21st century. 200mW red laser (650nm) with temperature control is one of the laser of   green laser pointer     .
In photovoltaic technology, one of its basic technology is the laser technology. The scientific community predicts that by 2010, information industry will be dominated by the photoelectric IT form of $ 5,000,000,000,000 industrial scale from 2010 to 2015, the optoelectronics industry may replace the traditional electronics industry. Photovoltaic technology will be renewed impetus following the microelectronic technology revolution and progress of human science and technology. Laser technology and industrial development will support and promote high-speed, broadband, vast amounts of optical communications and network communications, and will lead to a lighting technology revolution, compact, reliable, long life, energy-saving semiconductor (LED) will dominate the market, in addition to the introduction of a wide variety of the photoelectron consumer products (such as VCD, the VD D, digital cameras, new color TV, Pocket PC electronic products. The security of    green laser pointer      is of importance.
Smart phones, hand-held audio playback device, photography, projection and imaging, office automation photoelectric devices such as laser printing, fax and photocopying, etc.) and new information technology products (such as CRT, LCD and the PDP, FED, OEL flat panel displays, etc.) and into people’s daily lives. The laser has become the eyes and nerves of modern weapons, the photoelectron military equipment will change the pattern of war in the 21st century. Special processing, also known as “non-traditional processing” or “modern processing methods,” refers to electric energy, heat, light, electrochemical energy, chemical energy, sound energy and special mechanical energy to remove or add material processing methods, in order to achieve the material to be removed, deformation, change the performance or plating.    laser pointer pen will not influence to take pictures of the stars.
Has many unique features compared to traditional machining methods: processing range from the limit of the material physical and mechanical properties [1] can be processed any hard, soft, brittle, heat or high melting point metal and nonmetallic materials . Ease of processing of complex surfaces, fine surface as well as flexible parts. Easy to get a good surface quality, thermal stress, residual stress, work hardening, heat-affected zone and so is relatively small. Easy to compound a variety of processing methods to form a new technology, easy application. The main fields of application of special processing techniques.    green laser pointer      can display PPT in the computer.

In recent years, China’s information industry is developing rapidly, the urgent demand for information functional materials research and development of independent innovation. It is significant demand in this country, the team of semiconductor materials based on various disciplines, the direction of the cross together the research of new features excellent functional materials preparation, performance control and device applications. In this context, Materials and Chemical Engineering Professor Yang Deren as the leader of the research team established research interests: Functional Materials for Informatics. The team around new functional materials preparation, structure and performance control, to achieve on-demand design, information materials for preparation of the special features of the target. The specification of    green lase pointer has to meet requirements of the customer.
Developed to carry out different types and characteristics of new functional materials, the establishment of the theoretical system, to fight a series of technological innovation, and establish a solid foundation for research and development of information function devices. Relying on the State Key Laboratory of creating innovative team. Functional Materials for Informatics Research relies on the State Key Laboratory of Silicon Materials of Zhejiang University, Zhejiang University as the core of the lab materials physics and chemistry is a national key disciplines, establish the Ph.D point of the first semiconductor material in 1986. Zhejiang University has a long history of Functional Materials for Informatics Research in the early 1950s began under the leadership of the leading semiconductor the experts Que Duanlin academicians the semiconductor materials research. Here will present the difference between red ray    green lase pointer      and blue ray    green lase pointer     .
Has made a series of important results. Achieved significant results, particularly in silicon materials research and industrial to obtain a State Natural Science Award, National Invention l item, the national invention prize two, provincial and ministerial level scientific and technological progress prize of more than ten. Relying on laboratory solid foundation and disciplinary background of the formation of the team, have excellent academic leaders and key members of the close and in-depth cooperation in the field of Functional Materials for Informatics, they have already started. Yang Deren and Sha Jian, Ma Xiangyang, such as cooperation in the low-dimensional functional materials has made considerable progress, synthesized a variety of one-dimensional semiconductor nanomaterials, and to study their optical and electrical properties. The shell color of     laser pointer pen can be blue.
Money Guodong and Qiu Jianrong made outstanding achievements in femtosecond lasers, as well as composite optical materials. Yang Deren and closely cooperate closely in the magnetic properties of low-dimensional functional materials. In recent years, the team leader Yang Deren and three backbone Qiu Jianrong Chen Zheng, Qian Guodong has won the National Outstanding Youth Science Foundation, the backbone of the other two closely Ma Xiangyang selected for New Century Excellent Talents of Ministry of Education, Training Plan, the team also absorbed a group of outstanding young scholars to enrich the research efforts. Made a series of technological innovation in the field of Functional Materials for Informatics. Since returning in 1998 to carry out research work, the team leader, Professor Yang Deren made a series of groundbreaking research. When     green lase pointer      is used as torches, they send out white light.
Preparation and Properties of Functional Materials for Informatics research areas in the advanced international level, research results, such as second prize of National Natural Science doped nitrogen impurities and defects in silicon. Team in the large-diameter silicon single crystal growth, defect engineering of silicon and monocrystalline silicon micro-nitrogen impurity defects in basic research, a series of high level papers published in international academic journals and conferences in the international silicon material academia occupies a unique status. Young backbone and the school culture by absorbing the introduction of talent, the team’s area continuously expanded, pioneering the study of compound semiconductor optical functional materials, has made great progress in the study of organic semiconductor materials, organic / inorganic composite laser materials and devices. All the laser rays of     green lase pointer      are visible.

Electronic ceramic materials focus on developing high-performance dielectric ceramics (AC high voltage ceramic material, type III porcelain, MLC ceramic material), thermistors (NTC, PTC), varistor ceramics (high-pressure low-energy of ZnO and SrTiO 3 with dual-functional ceramic materials) piezoelectric ceramic, microwave ceramic materials, and comprehensively promote the chip type of ceramic components, the development of multi-chip assembly with a ceramic substrate materials. Piezoelectric the transistors materials focus 900MHz/1800MHz to phone required for the localization of high frequency SAW filters for the needs of the target to complete the large size, high uniformity, high integrity, quartz (α-SiO 2), lithium niobate (LiNbO 3 ), lithium tantalate (LiTaO 3), the industrialization of lithium tetraborate (Li 2 B 4 O 7) materials. Even the power of green ray    green lase pointer is lower than that of red ray laser pointers.
Carry out the the niobium potassium (KnbO 3), langasite (La 3 of Ga 5 SiO 14) and so on. The development of a new generation of high performance pressure transistor and the ZnO / Al 2 O 3 and SiO 2 / ZnO / DLC / Si high-speed of sound material foundation for the development of a new generation of high-frequency SAW and BAW devices. Green battery materials focus on the development of nickel-metal hydride battery is the anode material (MH alloy, Ni (OH) 2) and lithium-ion battery positive and negative electrode materials (of LiCoO 2, LiMn 2 O 4, of MCMB carbon material). Information sensing materials for automotive and other sensor materials, semiconductor materials and functional ceramic materials; for medical examination and comfort of the sensor material. Semiconductor materials, functional ceramics, polymer sensing materials and fiber materials; materials for office and industrial and agricultural production automation sensors. The main reason is because the green laser module adopted by the    laser pointer pen is more expensive.
Main semiconductor materials and functional ceramic materials; materials for sensors in the field of communications and broadcasting, the main semiconductor materials and functional ceramic materials. The information industry is a pillar industry of our country, is in a period of rapid development, but the information functional materials research and development compared with developed countries there is considerable distance, many of the key technologies and devices rely on imports from abroad, which severely restricted the information industry independent innovation and further development. To solve this problem, all directions of the various disciplines need materials, chemistry, physics-based crossover and innovation, collaborative research of the preparation of new functional materials, performance, control, and device applications.     green lase pointer      can be used to detect the currency.
Ministry of Education recently issued a document published in 2006, “Cheung Kong Scholars and Innovative Research Team” list of selected team, school leaders, Materials and Chemical Engineering Professor Yang Deren functional materials research team selected one. Integration in all areas of the innovation team, outstanding professional experts, high level of research groups, as the goal of high performance functional materials around new functional materials preparation, structure and performance control, establish the theoretical system, to achieve a series of technological innovation. Targeting national pillar industry. The information industry is the pillar industry, dependent on advances in information technology development and application of information functional materials. Over the past few decades the development of information technology is built on the basis of the continuous development of silicon material as the cornerstone of the integrated circuit industry. The client can require the appearance of     green lase pointer     .
From the microelectronics era of the integrated circuit industry toward nanoelectronic, optoelectronic integrated era. In the foreseeable future, the silicon material will continue to play a most important role in the IC industry and IC industry will continue to occupy the most important position in the information society. On the other hand, the increasing development of information society, large-capacity information transmission, high-speed data processing and high-density storage increasingly high demands. To meet this demand, world-wide are actively exploring the development of new information technologies and materials, such as: silicon-based integrated optoelectronics, new laser sources, nonlinear optoelectronic materials, composite optoelectronic functional materials, and continue to make new breakthroughs and progress. The color of    green lase pointer      has been determined.

Semiconductor polysilicon. Semiconductor polysilicon annual output of about 40 tons, the acceptance of the annual output of 100 tons of polysilicon trial production line in early 2000; monocrystalline silicon production capacity of 300 tons / year, producing approximately 260 tons / year; the monocrystalline diameter of 2 to 8 inches , which φ4 inches polished wafer diameter of 2 to 6 inches, the total output of 020 million square inches; foreign manufacturers of polysilicon manufacturing economies of scale of 1000 tons / year, polished wafers of 060 million square inches / year , global polished silicon yield about 40 million square inches to 6 inches in diameter and 8-inch main, polished silicon wafer production in China accounts for only five thousandths of world production, polished wafers φ4 inches in diameter , the φ8 inch polished wafers is still in the prototype stage. Logos of     green lase pointer could also be specially silk-screened.
The new structure of SOI materials, domestic only carried out a preliminary study, there is considerable distance away from the practical. Compound semiconductor materials: GaAs single crystal to φ2 ~ 3 inches, mainly developed only the the φ4 inch single crystal sample, the production capacity of 600 kg / year; domestic GaAs single crystal properties can basically meet the needs of the device, circuit, there is The main problem is the poor quality of the chip surface processing, reach out of the box with the requirements; of InP single crystals practical level φ2 inches; for IRFPA HgCdTe epitaxial thin films by the substrate size limitations, the largest size 20mm × 20mm. Low-dimensional and wide band gap semiconductor materials: China has developed a low-dimensional semiconductor materials HEMT, PHEMTs, HBT, and other microelectronic devices and quantum-well lasers, modulators, optical bistable devices, etc.. The beam distance of    green lase pointer      is 500-6000m.
GaAs-based quantum-well micro-structural material has reached the practical level. InP-based quantum-well micro-structural materials is still in laboratory development phase. GeSi / Si materials are being developed, not yet practical. On wide band gap semiconductor material, carried out the SiC / Si, GaN-based, a preliminary study of the diamond epitaxial materials, SiC and single crystal GaN substrate development has just started. Solid-state laser crystals and nonlinear optical crystal: in China of Nd: YAG laser crystal diameter of the maximum size of φ60mm commercialization of size φ40 ~ φ60mm, the annual output of about 2000 to 4000 million. China’s YVO 4 and Nd: YVO 4 laser crystal with international advanced level, accounted for 1/3 of the international market; In addition, Ho: Cr: Tm: YAG and Er: YAG, Ho: Cr: Tm: YLF, Ti: Al 2 O 3, etc., the ability of small batch trial. 3 pieces of button cell batteries is needed for    green lase pointer     .
But not the formation of bulk products. China’s first in the production of nonlinear optical crystal, BBO, LBO crystal to monopolize the world market in the late 1980s to early 1990s. KTP, BGO, Fe: KNbO 3, BaTiO 3, LAP and other high-quality nonlinear optical crystal has entered the international market, a larger share. In addition, the quality of the domestic fiber production has reached the international first-class level, but the core material for the manufacture of fiber – optical fiber preform 80% to 90% dependent on imports. Domestic liquid crystal material and the low level of production can only provide part of the TN type liquid crystal material, and can not produce the wide temperature low viscosity TN display with LCD. Domestic piezoelectric material in addition to α-SiO 2 yield large part outside the exit. The difference between yellow ray  laser pointer pen and blue ray    green lase pointer      will be contained.
The majority of the low level of industrialization, small-scale, high-performance materials to be imported. Electronic ceramic materials production to meet domestic demand, but the quality of products, especially electronic ceramic components, the chip level and international level gap. Domestic battery materials in terms of uniformity, consistency, electrical / chemical properties than the capacity of foreign products, there is a gap. Magnetic materials focus on developing high-performance soft ferrite, ferrite, anisotropic bonded permanent magnet, microwave ferrite nanocrystalline magnetic material and talent recording material (high-performance fine metal magnetic particle, high-performance metal heads materials, magnetoresistance and magnetoresistive materials and giant magnetoresistance materials, etc.). This kind of red ray     green lase pointer       have three functions.

The pulse width is one of the important parameters of the pulsed laser welding, it is both different from the material removal and material melting parameters, the key parameters in determining the cost and volume of processing equipment. Defocus amount of welding quality. Laser welding usually requires a certain defocus, high power density of the laser focus at the spot center, easily evaporate into the hole. Leaving the laser focus plane, the power density distribution is relatively uniform. Defocused mode in two ways: positive and negative defocus defocus. Focal plane at the top of the of the workpiece being away from the focus, and vice versa for negative defocus. Geometrical optics theory, when the positive and negative to make a fuss about an equal corresponding power density is approximately the same plane, but actually the weld pool shape. The single projection    green laser pointer will be shown.
Negative defocus, the availability of greater penetration, which is related with the formation of the molten pool. The experiments show that the laser heating 50 ~ 200us material begins to melt, the formation of liquid metal and asked the sub-vaporization, the formation of city-pressure steam, and at very high speed jet, and a dazzling white. At the same time, high concentrations of vapor liquid metal movement to the weld pool edge, the formation of depression in the weld pool center. When negative defocus, the power density of material internal surface area is also high, easy to form a stronger melting, vaporization, so that the light pass deeper into the material. Therefore, in practical applications, when the requirements of the penetration depth larger negative defocus; welding thin material, it is appropriate defocus. The single dot laser of   green laser pointer    can be avoided at any time.
Laser welding is one of the important aspects of laser material processing applications. The 1970s is mainly used for welding thin-walled materials and low-speed welding, the welding process is a thermal conductivity type, the laser radiation heating the surface, the surface of the heat through the heat transfer-oriented internal diffusion control the width of the laser pulse energy, peak power and repetition rate other parameters so that the workpiece to melt, the formation of specific bath. Because of its unique advantages, have been successfully used in micro-precision welding of small parts in high-power CO2 and high-power YAG laser appears, has opened a new field of laser welding. To obtain deep penetration welding, to the effect of holes as the theoretical basis and increasingly widely used in machinery, automobile, steel and other industrial areas. The moving stretching and shrinking of     laser pointer pen are good.
The high brightness of the laser, directional and good light (power) can be concentrated in a small area, since the first laser was born, people began to explore the application of laser processing areas. Began the early seventies, the Nd: YAG laser used for industrial production. With the development of high-power lasers and laser technology, laser material interaction study in-depth, laser processing has become a commonly used technique in the processing area. Laser processing as a non-contact, non-polluting, low noise, saving green materials processing technology also has the characteristics of the information age, to facilitate the realization of intelligent control, highly flexible and modular processing technology to achieve a variety of advanced processing technology integration. 300mW mixed yellow laser can be shown by   green laser pointer    .
Therefore, the laser processing has become an indispensable part of the 21st century advanced manufacturing technology. The laser processing refers to the object deformation caused by the laser beam acting on the surface or the modified process. In accordance with the role in the mechanism of light and matter can be divided into the processing laser thermal processing and laser photochemical reactions [33]. Laser thermal processing caused by a variety of rapid thermal effects by adding object-based laser beam processing. Laser photochemical reaction is triggered or controlled by the photochemical reaction of a variety of process by means of high-density high-energy photons. Both processing methods can be the material for cutting, drilling, grooving, mark. Former welding of metallic materials, surface modification, alloying is more favorable, the latter is applicable to the photochemical deposition, laser etching, doping and oxidation. The   green laser pointer     system can change the deflection angle of the laser reflector.

Laser thermal processing is now more mature, this chapter focuses on issues related to laser thermal processing. The laser-induced chemical processes will make a brief introduction in Chapter 10. This section discusses the principle of laser thermal processing. No matter what kind of laser processing method, they must be some power laser beam is focused on the object to be processed, so that the laser interaction with matter. Metal processing, for example, the power density of 104 ~ 1011W ? CM-2 laser focusing irradiation, the surface will absorb a large amount of laser energy. With the passage of irradiation time, will produce a variety of interaction between the laser beam with the metal surface. The first is the heat absorption process, so that the material to local heating. As the bus technology of flash disk develops, the data transmission technology of flash disk is becoming more and more perfect and so does     green laser pointer .
The laser pulse energy is high enough, the pulse width is short enough impact to strengthen the process. With the continued, the temperature of the thermal effect, leading to surface melting process. Continued exposure, the molten pool to the internal development of the pool surface gasification process. Almost at the same time, the plasma began to the formation of vapors and plasma shielding phenomenon. Continuous exposure, the weakening of the shielding effect, known as a composite process [34]. With all of the above-mentioned process corresponds to the range of applications in a variety of different laser parameters and processing as shown in Figure 7-1. The laser pulse width of 10ms or so, focused power density when the 102W/mm2, acting on the metal surface, mainly produce the temperature rise phase transition, as a laser transformation hardening. The name of   green laser pointer    is 100mW bright laser pointer pen.
Laser action time between 10 ~ 4ms, focused power density in the range of 102 to ~ 104W/mm2 of metal materials in addition to the temperature rise to melting phenomenon is mainly gasification, and also the shock wave can be used to melt welding, alloying and cladding. Laser time in 10-4s, focused power density in the range of 105 to ~ 109W/mm2 of metal materials in addition to the temperature rise, the melting phenomenon, but also gasification at the same time the shock wave and explosion impact, mainly used in the punch , cutting, marking and tuning. Laser in the <10-6s, focusing power density increased 109W/mm2,, in addition to the produce of the above phenomenon, metal heat compression shock and metal on the surface of the explosion knock-on effects into a major phenomenon, mainly for shock hardening. The momentary switch of   green laser pointer    can make the laser pointer more convenient to be used.
The physical description of the laser material interaction process can be divided into the following four aspects. The first occurred when the laser thermal processing of materials on the absorption of laser energy. The laser beam irradiated to the surface, with the exception of part of the surface reflection, the rest of the penetration inside the material absorbed by the material. Light penetration inside the material of the material from heating. Different materials of different wavelengths of laser absorption rate. Assume that the surface reflectivity, the absorption rate for most metals, the reflectivity of 70% -90%. When the laser from the air at normal incidence to the plate material, according to the Fresnel formula, the reflection rate and complex refractive index as the material type in the real and imaginary part, non-metallic materials, the imaginary part is zero. This kind of      laser pointer pen can be used by the teachers, lecturers, astronomy enthusiasts, gallery guides and museum guides and so on.
In fact, metal absorption of laser and temperature, surface roughness, with or without coating, the laser polarization properties, etc. related to many factors. Metal and laser interaction, the spot at the temperature rise caused by melting, boiling and vaporization, leading to the conductivity change will make the reflectivity of very complex changes. The heating of the material is the process of light energy into heat energy. Of the incident laser beam power density is the optical power density absorbed by the surface, there has been proved in 1.5, laser materials, the internal communication process in the light intensity decays exponentially. The intensity of the laser incident from the surface to the material internal depth at the point of light (electromagnetic field) power density. They can use   green laser pointer     to highlight and point at the key item during the teaching, lecture, meeting process and so on.

Where the absorption coefficient. The laser penetration depth in the material generally defined as the light intensity down to the depth of I0 is / e, and thus the penetration depth. The absorption coefficient of most metals is about 105-106cm-1, the magnitude of the laser depth of penetration of various metals in the l0-100nm. Relatively low, non-metallic reflection of the laser, the absorption is relatively high. But some non-metallic materials in a certain band of the absorption coefficient is very low; such as of GaAs, ZnSe, NaCl, KBr, CdTe and Ge et al, is used as the output window material in the infrared high-power lasers and the optical path of the lens material.    green laser pointer is delicate and beautiful in shape and appearance.
Laser beam is absorbed in a thin metal surface layer, so that the thermal motion of free electrons in the metal can increase the collision with the lattice, and in a very short 10-11-10-10s period of time, the electron kinetic energy into the lattice thermal vibrations. Material temperature, and then spread around and inside the material in accordance with the mechanism of heat conduction. In order to get the temperature distribution of the heating stage, we must solve the heat conduction differential equation. For isotropic homogeneous material, laser heating, the thermal conductivity of the general form of partial differential equations [34] theory, the type (7-4) (7-5), (1-89) Simultaneous up , according to the processing of various process parameters and initial conditions, we can solve the temperature distribution of the laser processing area. The trigger voltage of   green laser pointer     is DC 2.8V.
But the actual processing, irradiation of the laser is not as formula (1-89) shows the one-dimensional distribution; during irradiation in the absorption coefficient, thermal conductivity λt, material density and specific heat capacity and so no longer is a constant is a four-dimensional variables. These parameters variation in the microscopic case, nor can the macro-static experiments to obtain. But also in the process of laser heating, the thermal physical parameters (such as the absorption ratio, specific heat capacity, thermal diffusivity and thermal conductivity, etc.) with increasing temperature change, if they are a function of temperature is the heat conduction equation becomes highly non linear. Therefore, the solution of the heat conduction equation is very difficult. Various logos of   green laser pointer    in different sizes and appearances can be silk-screened.
Although not for the actual laser thermal processing to solve the temperature field distribution of the direct guidance of laser thermal processing and process design, a number of simplifying assumptions about the results or meaningful. If the semi-infinitely large (that is the object thickness infinite) surface has been heated by a uniform laser vertical irradiation was surface absorption optical power density is not time to change, and exposure time sufficient length, as well as be absorbed energy, which generate the temperature to achieve dynamic balance between heat conduction and thermal radiation, the center of a circular laser spot temperature can be determined by the following formula [36] further assume that the irradiation laser is a Gaussian beam incident to the beam radius on the surface for the laser spot power density can be used to leave the distance from the center. The stargazer can observe the star he or she wants with    laser pointer pen more conveniently.
The failure process caused by the laser irradiation reach target (processed materials) in the high power laser surface melting and gasification temperature, so that the material gasification evaporation or melting of spills, while the internal micro-cracks and defects of the target due to material melting and other field strength changes further expansion, resulting in the dynamic processes of fatigue and destruction of the surrounding material. The laser power density is too high, the material in the gasification of the surface, not deep melting; laser power density is too low, the energy spread to the larger volume, so that a very small depth of focus at the melting. And at the same time the shell color of   green laser pointer    can be customized according to requirements of the customer.

This target shell deformation or disintegration of the scene of the damage the target known as structural mechanics destruction. When the laser is in optoelectronic devices so that the temperature rise will seriously affect the technical performance of optoelectronic devices and render ineffective. For example, a photoelectric detector, the temperature is too high, the light is too strong it will greatly affect image quality, and even does not work. This case is the destruction of optoelectronic devices. 3, the laser weapon fired thermal ablation destruction of aircraft defense pathway developed by the United States are mainly rely on the power density threshold damage target short-pulse high-energy laser, such as transmit power of the airborne laser, space-based laser weapons 3MW the transmitting power of the carrier-based lasers and ground-based lasers will eventually reach megawatts. The   green laser pointer      company is well known supplier of   green laser pointer      .
Launch vehicle laser weapons “Nautilus” power of 500kW, both nanosecond pulse width and micron wavelength, each fired a duration of 3 ~ 6s. Laser radiation to targets in the air after some time need to be stable in a fixed position to accumulate enough energy to the target burned. The foregoing analysis, we know that, in such a powerful high-power pulsed laser irradiation does not make sense to increase the thermal conductivity of the target material for the defense laser thermal ablation damage, the defender should focus on the following aspects: (1) The aircraft should be rolling flight. The laser light of    green laser pointer       irradiates pointing to one direction.
Rotating flight of the missile body, scroll flying satellites in orbit irregular tumbling flight, the aircraft immediately in the event of laser irradiation, the laser can not be pegged to a fixed part of the aerial targets accumulation of energy, extend the time by the laser burned, effective defense of the thermal ablation destruction. (2) vehicle shell can be anti-laser structure design. American Studies for satellites, aircraft, missiles, aircraft anti-laser ablation destruction of the protective shell structure. Missile, for example, the anti-laser protective structure will not increase too much the total cost and total weight of the missile. This anti-laser ablation structure has two heat-resistant layer, sandwiching a layer of anti-laser ablation of the barrier layer, three layers bonded together, solid joint to the outer surface of the missile shell. The packing information of     green laser pointer is complete enough.
An early missile shell structure (called a structure), Figure 2 shows the shell structure of the modern missile (called the 2 structure), Figure 3 for the anti-laser missile shell design structure (called structures). A structure includes a metal shell (11), the fuel seal bushing (12). 2 structure, 23 outsourcing layer 21 of the missile shell structure of the glass fiber composite materials, sealing bushing 22 as fuel. 3 structure is the anti-laser ablation structure, missile shell contains a layer of glass fiber component 31, the fuel sealing bushing 32, 33, 34, 35 The role of anti-laser ablation, 33, 35 of which is heat-resistant layer. cork composite materials (cork, phenolic, cork, epoxy resin, cork nitrile rubber), the thickness can choose between 0,1 ~ 1cm; 34 is the ablation of the barrier layer is generally of carbon fiber fabric impregnated with heavy metals, resin. The gross weight of      laser pointer pen should be greater than net weight of   green laser pointer      .
Experiments show that this structure has a strong anti-laser ablation performance. The laser processing Zhou Jian Southwest University of Engineering and Technology 2003 Mechanical Design Manufacturing and Automation Class 1 laser technology is an emerging science developed in the early 1960s, has gradually formed a new processing methods in materials processing – laser processing. Laser processing can be used for drilling, cutting, fine-tuning of the electronic devices, welding, heat treatment, and laser storage and other fields. Because the laser does not require processing tools, and processing speed, surface deformation is small, can process a variety of materials, more and more to show his superiority in the production practice. So popular with the people’s attention. There are some technical problems for this kind of   green laser pointer      .