Study On Gaussian Beam Homogenization In Cmplex Field

With the rapid development of science and technology,many areas of research have made breakthroughs.Since the laser appeared in 1960s,it has gradually entered the civil field from the military field.From emitting pulse at very low temperature,which can only be created by liquid nitrogen,to the heterojunction interposition of liquid phase epitaxy and gas phase epitaxy,which can make laser emission stable at room temperature,from single heterojunction to double heterojunction with lower threshold current density and more efficient radiation limiting recombination,from semiconducting to today's fiber and quantum lasers,with the technical innovation of microelectronics and Optoelectronics Laser has been extended in daily life.In order to use laser more effectively,laser homogenization has become an important issue.The concept of beam homogenization has been put forward for more than half a century,which belongs to non imaging design and is also a typical reverse design.With the efforts of predecessors,the mathematical model of Gaussian beam has made great progress in both single light field and complex light field.However,with the continuous progress in the fields of medical treatment,manufacturing and aerospace,the requirements of various fields for the performance and accuracy of laser are constantly improved,and there are still many technical problems in the aspects of optical efficiency,processing means,application range,etc.In this paper,under the condition of considering the homogenization efficiency and manufacturing technology,the aspherical lens group is selected for further study of laser homogenization technology.The traditional aspheric lens can basically meet the homogenization of the basic mode Gaussian beam of the low-power laser on the premise of a large amount of calculation force.If the rated power is required to be increased,the basic mode Gaussian beam will be transformed into the high-order mode(Laguerre beam,Hermite b eam,etc.)in the complex field,while the traditional design method is difficult to meet the requirements.Therefore,in this paper,a complete set of high-order mode laser homogenization process is designed by using several modern CAE software such as ZEMAX,TracePro and MATLAB on the existing high-order mode mathematical model,so as to further improve the laser homogenization technology.In this paper,first of all,various mathematical models of Gaussian beam are combed,and various models are visualized by MATLAB,and how the important shape factors of various models affect the model is pointed out;then,the appropriate model is selected for preliminary theoretical design,and the results of preliminary design are observed by ZEMAX;then,the homogenization effect and machining difficulty are affected by various par ameters of lens group The initial structure of the lens surface is determined by the study of the response weight,and then the final structure is determined by programming the ZEMAX macro language optimization program.In this paper,the ultra precision single point diamond lathe is also used to process and test the lens,and it is concluded that the lens that meets the use conditions can be processed with the current processing level to verify the feasibility.Finally,the ray tracing is carried out by the simulation software TracePro to verify that the lens designed in this paper canmake the high-order Laguerre Gaussian beam achieve high uniformity.