Tilt error's characteristic analysis of dual liquid crystal polarization grating system
In order to precisely control the direction of laser beams,we analyze the error caused by the grat-ing tilt in the system based on the optical beam pointing algorithm of the dual liquid crystal polarization grat-ing system.Firstly,a ray tracing method based on the diffraction grating equation is used to solve the outgo-ing beam pointing,introducing the incident beam pointing and grating tilt angle.The correctness and accur-acy of this method are verified through comparison with simulation results.Secondly,by analyzing different cases of grating tilt,we provide expressions of the grating attitude under different tilt conditions,and in com-bination with the ray tracing method,obtain the expressions for the outgoing beam pointing for correspond-ing situations,analyzing the zeroing error and rotation error caused by grating tilt.The research results indic-ate that within the 0° to 0.3° grating tilt angle range,the zeroing errors are within 0.25 mrad and 2 mrad re-spectively,and the rotation errors are around 85 mrad and 430 mrad,respectively.We propose a method for accurately calculating the pointing direction and grating tilt errors in the exit beam of a dual liquid crystal po-larization grating system.
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