Study Of Response Time Depending On Device Parameters Of Liquid Crystal Wavefront Corrector

Liquid crystal wavefront corrector is the key device in liquid crystal adaptiveoptics system. One of most urgent problems is the slow response time. In order tosolve this problem, researchers have proposed that synthesizing high birefringence,low viscosity nematic liquid crystal, or new liquid crystal (like dual-frequency liquidcrystal and so on) contributes to improving response, but the improvement is limited.New liquid crystal operation mode and driving mode can also improve the response,they still have many problems in the process of practicality. This paper studies theinfluences of several important device parameters(liquid crystal cell gap、 drivingvoltage、 temperature) on response of liquid crystal wavefront corrector.In this paper, liquid crystal molecular dynamic equation is solved to obtain responseformula with fixed phase retardation2π, taking the partial of response formula withrespect to cell gap, the calculation values are optimal cell gaps based on the fastestresponse, and theoretical values are confirmed by experiments. On basis of optimalcell gaps, the impacts of driving voltage on response time are studied. Demonstratedby theoretical analysis and experimental results: response time does not decrease regularly while the applied voltage increases, not only the variation of response timedecreases gradually, but also response time changes little while driving voltage is highenough. Dealing with the operation temperature of liquid crystal device theoretically,the formula of optimal operation temperature based on fastest response is obtained,calculating optimal operation temperature with approximation, conducting ratio ofknown liquid crystal constituents after obtaining properties of liquid crystal mixture.