Algorithm Of Tolerance Optimization Based On Beam Pointing Stability

The image quality of optical system will be effected by many factors.In addition to aberration,diffraction limit,Lagrange invariant and other internal constraints,the image quality degradation caused by external disturbance shouldn't be ignorable.For a certain optical system used to focus through long distance like large-scale laser systems,tiny vibration may result in tremendous effect on the position of focus point and then reduce focusing precision.So it is necessary to analyze optical system under external disturbance with relative software and calculate appropriate tolerance range to meet requirement of image quality.This paper makes research on the effect of external assembly tolerance on image quality and mainly studies the focus point deviation of laser system with decenter and tilt tolerance through long distance.The whole research is based on theory of optical matrix,according to approximation to second-order quantities combining with adaptive interpolation,derive linear tolerance model about decenter and tilt,then get the appropriate tolerance range.Compared with the common method,this adaptive optimization algorithm can allocate tolerance of each element more reasonably and spend less optimization time.With the module like tolerance analysis in Zemax,the simulation platform is mainly based on optical software OTS developed by own department.Moreover,aiming at this tolerance model,design corresponding experiment on the effect brought by decenter and tilt tolerance of element to verify its correction.The whole algorithm combines with ray trace,numerical analysis,random samples,etc.Compared with others,it shows better performance and can calculate the appropriate tolerance range within acceptable time.