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紫外光敏材料硅酸铋(BSO)在短波长的蓝紫光激励下电阻率会急剧降低,可作为良好的光信息写入材料,用作光寻址的液晶空间光调制器(LC-SLM)的感光层。介绍了以BSO为基的光寻址透射式液晶空间光调制器的结构和工作原理,从BSO晶体产生光电导效应的机理出发,得到了光电流和光照功率的关系,实验测最了BSO晶体片在不同频率和不同强度的光照下的光电响应。通过对液晶分子指向矢分布随电压变化的理论计算,得到了在不同光照强度下BSO基的液晶空间光调制器产生的光程差,与实验中液晶盒在不同电压下产生的光程差有相同的变化趋势。
The UV-sensitive material bismuth silicate (BSO) shows a sharp decrease in resistivity under short-wavelength blue-violet excitation and can be used as a good optical information writing material for LC-SLM Photosensitive layer. The structure and working principle of BSO-based light-transmissive liquid crystal spatial light modulator are introduced. The relationship between photocurrent and light power is obtained from the mechanism of BSO crystal photoconductivity. The best experimental results are BSO crystal Photoelectrical response of films at different frequencies and different intensities. Through the theoretical calculation of the director distribution of liquid crystal molecules with voltage changes, the optical path difference of the BSO-based liquid crystal spatial light modulator under different light intensities is obtained. Compared with the experiment, the optical path difference of the liquid crystal cell under different voltages is The same trend.