To meet the high requirements and various needs of the customer of green laser pointer

Jiangsu Polytechnic University and Nanjing University [11], 2024T62 aluminum alloy by laser shock processing, laser impact zone hardness increased by 42%, 95% confidence level, the LSP test the value of the fatigue life of laser impact specimen 5.4 to 14.5 times. Jiangsu Polytechnic University [12] of 45 steel by laser shock processing, the LSP District hardness increased by 32%, the LSP test the value of the fatigue life is not the impact of the specimens from 1.11 to 2.133 times (95% confidence). As the stress of laser shock-wave duration is very short (microseconds), especially the local area with stress concentration on the effective handling of the finished parts, such as increasing the fatigue life of the local area in the corner, holes, slots and other finished parts, so the LSP technology, engineering application. The positive pole of the battery of    green laser pointer will be marked as “+”.
Huazhong University of Science [13] studies show that laser shock processing a substantial increase of LY12-the CZ aluminum alloy fatigue life of the microscopic mechanism of dislocation density after the laser shock increased by 21 times the surface residual compressive stresses 49.43MPa . See [14] in the laser shock processing annealed T8 steel laser shock induced martensitic transformation and martensite explain the reasons for the hardness increased by 2 times. Principle in accordance with the piezoelectric conversion value to calculate the transient shock wave formation [15] Laser Shock of LY12-CZ aluminum alloy MPa grade, and laser shock wave is superimposed by a series of different frequency waves, which frequency waves in large proportion. It means that the diameter of this kind of battery of     laser pointer is 15mm.
Nanjing University [16], surface roughness and micro-pits two surface quality indicators and divided into four grades, as the identification and control of laser peening effect in the practical application, non-destructive testing methods. From the above, China has the basis of the application of laser shock hardening a lot of research has been relatively clear findings, the key issue is that as soon as possible LSPs with appropriate cost-effective industrial applications and equipment. Rapid laser melting solidification regular coagulation conditions. Many studies show that the solidification of the material characteristics of high temperature gradient and high solidification rate under the condition of Laser Rapid Melting traditional solidification theory can not completely reveal exactly the laws of the material solidified. When it is needed to manufacture    green laser .
At home and abroad in recent years, many researchers have done a lot of work. Which Northwestern Polytechnical University, solidified the State Key Laboratory carried out under the condition of Laser Rapid Melting of basic research. In laser rapid solidification microstructure formation of the principle [17] introduced the Laser Rapid Solidification Microstructures of the interface temperature selection theory, as well as single-phase plane cutting-edge, single-phase dendrites and flat growth in the three kinds of typical interface response function and its The predicted single-phase alloys, the eutectic alloy of gold and peritectic alloy laser rapid solidification microstructure. Different substrate materials on laser cladding. The laser cladding of the base materials are mostly cheap ordinary carbon steel and cast iron. In recent years, Tsinghua University, laser cladding of aluminum alloy as base material, a lot of work [18]. It is in charge of the incoming test of the raw material of    200mw laser pointer .
Succeeded in obtaining the uniform and dense SiO2 coating and Al2O3-TiO2 coating the surface of the aluminum matrix powder feeding laser cladding method. SiO2 coating thickness of 10 ~ 30μm Al2O3-TiO2 coating thickness up to 100μm, coating the internal dense defect-free coating with aluminum body good combination. Chongqing University [19] with a laser beam synthesis and coating of bio-ceramic coating on a titanium substrate material to be successful. Chinese Academy of metal [20] in Ni-based superalloy substrate NiCrBSi and NiCrAlY alloy powders of ZrO2 mixed powder laser cladding, the different structure of thermal barrier coatings. To meet the high requirements and various needs of the customer of    green laser pointer   .