结合高位深相位光栅图的LC-SLM标定

发布时间：2018-04-20 15:42

本文选题：光学器件 + 液晶空间光调制器　；参考：《激光技术》2017年04期

【摘要】：为了提高对液晶空间光调制器(LC-SLM)的校准精度,采用高位深相位光栅图对LC-SLM进行了标定。在LC-SLM上加载16位深度相位光栅图,并使光束经LC-SLM调制后生成衍射光斑;测量衍射光斑中心光强,经过计算分析得出计算机灰度信号与相位调制量之间的映射关系,最终得出针对488nm激光的LC-SLM标定LUT文件(LUT16)。结果表明,在LC-SLM上加载0~2π涡旋相位,并结合LUT16文件调制光束可以得到光斑质量很好的中空光斑,这与结合LUT8文件调制的中空光斑相比,光斑质量从0.53提高到0.76,提高了1.43倍。针对特定波长,利用高位深相位光栅图标定LC-SLM得到的LUT文件可以使LC-SLM根据加载相位对光束进行有效调制,且调制效果优于结合LUT8对光束进行调制的结果,对LC-SLM的校准精度得到提高。
[Abstract]:In order to improve the calibration accuracy of liquid crystal spatial light modulator (LC-SLM), LC-SLM was calibrated by high depth phase grating. The 16-bit depth phase grating is loaded on LC-SLM, and the beam is modulated by LC-SLM to form diffraction spot, the central intensity of diffraction spot is measured, and the mapping relationship between computer gray signal and phase modulation is obtained by calculation and analysis. Finally, the LC-SLM calibration of 488nm laser LUT file is obtained. The results show that the hollow spot with good quality can be obtained by loading 0 ~ 2 蟺 vortex phase on LC-SLM and modulating the beam with LUT16 file. Compared with the hollow spot modulated by LUT8 file, the quality of the spot is increased from 0.53 to 0.76, which is 1.43 times higher than that of the hollow spot modulated by LUT8 file. For a specific wavelength, the LUT file obtained by using the high depth phase grating icon to determine the LC-SLM can make the LC-SLM modulate the beam effectively according to the loading phase, and the modulation effect is better than that of combining the LUT8 with the light beam modulation. The calibration accuracy of LC-SLM is improved.
【作者单位】：中国科学院苏州生物医学工程技术研究所江苏省医用光学重点实验室;中国科学院大学材料科学与光电技术学院;
【基金】：国家重大科研装备研制资助项目(ZDYZ2013-1) 江苏省六大人才高峰资助项目(2012-swyy-020)
【分类号】：TN761

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