Long-distance transmission research for collimating system based on 532nm semiconductor laser

As the semiconductor laser has large divergence angle,and the divergence angle is asymmetric(in both vertical directions).Therefore,output beam must be collimated or refocusing system by optical systems in most practical work.Because of have simple structure and easy fabricating,the laser beam expanders have been used in many practical applications for beam collimating of semiconductor laser.This paper is the use of beam expander and put the 532nm semiconductor laser for collimating for long-distance targeting the application context,and then achieve a certain technical parameters.