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Phase Modulation Characteristics Analysis of Optically-Addressed Parallel-Aligned Nematic Liquid Crystal Phase-Only Spatial Light Modulator Combined with a Liquid Crystal Display |
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| Authors: | Fanghong Li Naohisa Mukohzaka Narihiro Yoshida Yasunori Igasaki Haruyoshi Toyoda Takashi Inoue Yuji Kobayashi Tsutomu Hara |
| Institution: | (1) Central Research Laboratory, Hamamatsu Photonics K.K., 5000, Hirakuchi, Hamakita, Shizuoka 434-8601, Japan;(2) State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, P.R. China |
| Abstract: | An optically addressed parallel-aligned nematic-liquid-crystal spatial light modulator (PAL-SLM) has been studied as a dynamic phase-only light modulation device. The phase modulation characteristics of the PAL-SLM using a liquid crystal display (LCD) as an addressing mask were investigated by analyzing diffraction efficiencies resulting from binary gratings projected from the LCD. A more than 2π phase-only modulation depth was achieved. The highest first-order diffraction efficiency of approximately 38% was also obtained; this is close to the theoretical limit. The experimental results of diffraction efficiencies depending on the phase modulation depth are in good agreement with the simulation for the system operation. |
| Keywords: | spatial light modulator liquid crystal amorphous silicon phase modulation liquid crystal display diffraction efficiency |
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