摘要
偏振是光的重要特性之一,在激光加工、成像方面有着广泛应用。光学元件对s光和p光的相位延迟差不同会使得其对光的偏振状态产生影响。诸如反射镜和二向色镜这类反射光学元件对出射光的偏振特性也会产生较大影响。通过实验测量了不同偏振和入射角度条件下,反射镜和二向色镜在反射过程中s光和p光的相位延迟差,并提出使用空间光调制器和液晶相位延迟器对这个差值进行补偿。实验结果表明,该方法可以使相位延迟差从25°降低到4°左右,从而有效抑制反射过程中偏振特性的改变。通过对相位延迟差的补偿,可获得与理论基本一致的Si(0 0 1)样品的偏振拉曼曲线。这项工作对在实际光路中精确控制光的偏振方向具有一定的借鉴意义。
Polarization is one of the important properties of light and has a wide range of applications in laser processing and optical imaging.Optical elements have different phase delays for s-polarized and p-polarized-light,which may distort the polarization status of light.Reflective optical elements such as reflection mirrors and dichroic mirrors also have significant influences on the polarization characteristics of light.To address this issue,this paper experimentally measured the phase delay difference between s-polarized and p-polarized-light in the reflection process of reflection mirrors and dichroic mirrors under different polarization and incidence angles.A scheme was proposed to compensate for the phase delay difference by using a spatial light modulator(SLM)or a liquid-crystal phase retarder.Experimental results showed that after the compensation,phase delay difference induced by reflective optical elements could be reduced from 25°to about 4°.Base on this scheme,polarized Raman signals of Si(001)sample were acquired in good agreement with theoretical prediction.The method proposed in this work could be useful for the precise control of the light polarization in polarization related research and applications.
作者
徐鸿帆
林剑
XU Hongfan;LIN Jian(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Institute of Photonic Chips,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《光学仪器》
2025年第6期38-47,共10页
Optical Instruments
基金
国家自然科学基金(11874267)。
关键词
相位延迟差
相位补偿
消光比
偏振拉曼
phase delay difference
phase compensation
extinction ratio
polarized Raman
