Design And Research Of Astigmatic Laser Beam Expanding Collimation Optical System

Currently,high-power slat lasers are an important development direction of solid-state lasers,with high average power and compact structure,and are widely used in military,industrial processing,and optoelectronic countermeasures.Using adaptive optics technology to perform wavefront correction on the laser beam can greatly improve the laser beam.This paper analyzes different types of beam expander systems and compares them to determine the subject of the refraction Galileo beam expander telescope system in the form of a beam expander.A mechanically compensated zoom system is used.Using a separate design,the three lenses form a small zoom system,which converts the ratio of the expanded beam ratio of the entire system to the easier calculation of the combined focal length of the three lens groups,and derives the zoom formula between the lens spacing in the zoom system.The selection of the focal length of the system lens and the limitations of the lens spacing are discussed and the initial structure is calculated.Discuss the selection of lens surface and materials,use ZEMAX optical design software to assist in the design,establish the initial structure of the system,establish a suitable objective function and select a good optimization algorithm,optimize the final structure parameters,and simulate the total wave aberration of the system.Less than 1/4 ?,the system modulation transfer function is good.The changes of beam passing through the two main low-order aberrations with 0 degree and 45 degree astigmatism are analyzed.The results show that the structure of the zoom beam expansion system can effectively reduce the influence of 0 degree astigmatism to some extent.In order to make the beam expander system feasible and adaptable,tolerance analysis of the optimized system is performed to ensure that the machining accuracy and the adjustment error meet the design requirements.Finally,the experiment shows that the zoom beam expansion system designed in this paper can improve quality of the input beam,compression divergence angle,reduce the power density of the beam.The problem is to minimize the use of cylindrical lenses and ensure different beam expansion ratios in both directions.At the same time,it provides an effective telescope expansion system zoom design and analysis approach for follow-up work.