纯相位液晶空间光调制器拟合泽尼克像差性能分析

The performance of phase-only liquid crystal spatial lightmodulator used for generating Zernike terms

纯相位液晶空间光调制器作为波前校正器构成的高分辨率、低能耗、价格低廉、易于控制的自适应光学系统受到越来越多的关注.作为一种新型波前校正器件,它对波前像差的校正能力是反映其在自适应光学系统中应用的一个重要的指标,因此有必要仔细地研究它对各种像差的校正能力,以确定其可能的应用范围.波前校正器对各阶泽尼克像差的拟合效果有效地反映了该器件对不同像差的校正能力.利用256×256像素的纯相位液晶空间光调制器(LC-SLM)产生不同系数的前36项泽尼克像差分析LC-SLM对不同像差的校正能力.讨论了填充因子、离散像素结构、相邻像素的相位交连、相位回卷方法及相位调制深度对器件像差校正能力的影响.

The liquid crystal spatial light modulators （LC-SLM） are recently emerging as wavefront aberration correctors for use in low cost adaptive optics system （AO）. As a novel aberration corrector, the wavefront generation performance of a phase-only LC-SLM is a governing factor that determines its ability for wave-front correction in an AO system. In this article, the performance of wavefront generation of LC-SLM is demonstrated by the production and quantification of the first 36 Zernike terms with different values. The factors, such as the fill factor, fringe field effect, pixel structure, the phase wrapping method and different phase strokes to impact wave-front generation are analyzed.