Systematic development for fast and high-accuracy wavefront corrector based on liquid crystal on silicon device

Abstract

ABSTRACT For wavefront corrector (WFC) based on liquid crystal on silicon (LCoS), existing good phase change linearity and fast response are the key requirements to achieve fast and high-accuracy performance. Aiming at this, refreshing manner and period is optimised firstly to minimise the temporal phase fluctuation derived from pixels phase updating. Grey bit of applied voltage used for LCoS-WFC is also optimised to form better phase linearity and phase modulating accuracy, whether the LCoS is under over-driving method or not. After optimisation, both the phase error derived from poor phase linearity and the temporal phase fluctuation derived from improper refreshing process could be reduced by nearly one time, and the phase modulated step can be reduced to 80% of that before optimisation. This result can not only save significant LCoS design costs, but also provide full design guidance for future improvement of LCoS WFC.