受激拉曼散射光谱中泵浦光偏振效应的研究

doi:10.3969/j.issn.1007-5461.2024.01.007

量子电子学报 ›› 2024, Vol. 41 ›› Issue (1): 78-86.doi: 10.3969/j.issn.1007-5461.2024.01.007

受激拉曼散射光谱中泵浦光偏振效应的研究

李涛 , 李玉慧 , 胡坤 , 王盼归 , 赵洪辉 , 喻远琴*

( 安徽大学物理与光电工程学院, 安徽合肥 230601 )

收稿日期:2022-03-22 修回日期:2022-04-22 出版日期:2024-01-28 发布日期:2024-01-28
通讯作者: E-mail: yyq@ahu.edu.cn E-mail:yyq@ahu.edu.cn
作者简介:李涛 ( 1994 - ), 湖北十堰人, 研究生, 主要从事非线性光学方面的研究。E-mail: 654081696@qq.com
基金资助:
国家自然科学基金 (21873002)

Polarization effect of pump light in stimulated Raman scattering spectroscopy

LI Tao , LI Yuhui , HU Kun , WANG Pangui , ZHAO Honghui , YU Yuanqin *

( School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China )

Received:2022-03-22 Revised:2022-04-22 Published:2024-01-28 Online:2024-01-28

摘要/Abstract

摘要： 与常规的自发拉曼散射相比，受激拉曼散射（ SRS）经常使用两束光场（泵浦光和Stokes光），这为偏振操控SRS 过程提供了一个额外的自由度。为此，开展了泵浦光分别为圆偏振和线偏振的SRS 对比研究。首先，基于非线性耦合波方程，从理论上分别推导了泵浦光为圆偏振和线偏振时（ Stokes光始终保持线偏振） SRS信号强度表达式。随后，以具有球对称的甲烷分子为例，实验测量了上述两种偏振光泵浦下甲烷分子υ1和υ3振动模在2800~3100 cm-1的SRS 光谱。实验结果与理论分析一致表明： SRS 的信号强度不仅与泵浦光的偏振态有关，还与待测分子振动模式的对称性紧密相关。本研究结果为SRS 的偏振应用提供了有益启示。

关键词: 非线性光学, 偏振效应, 受激拉曼散射, 泵浦光

Abstract: Compared with conventional spontaneous Raman scattering, stimulated Raman scattering (SRS) often uses two light fields (pump light and Stokes light), which provides an additional degree of freedom for polarization manipulation of SRS processes. A comparative study of SRS with circularly polarized and linearly polarized pump light field is carried out in this work. Firstly, based on the nonlinear coupled wave equation, the expressions of SRS signal intensity are derived theoretically under the cases that the pump light is circularly polarized and linearly polarized while Stokes light always keeps linearly polarized. And then, taking methane molecule with spherically symmetry as an example, the SRS spectra of υ1 and υ3 vibrational modes of methane molecule in the C-H stretching region (2800-3100 cm-1) are experimentally measured under different polarizations. The experimental results are consistent with the theoretical analysis, demonstrating that the SRS signal intensity is not only closely related to the polarization state of pump light, but also to the symmetry property of molecular vibrational modes. The research provides useful insights for the polarization application of SRS.

Key words: nonlinear optics, polarization effect, stimulated Raman scattering, pump light

中图分类号:

O437.3

李涛, 李玉慧, 胡坤, 王盼归, 赵洪辉, 喻远琴. 受激拉曼散射光谱中泵浦光偏振效应的研究[J]. 量子电子学报, 2024, 41(1): 78-86.

LI Tao , LI Yuhui , HU Kun , WANG Pangui , ZHAO Honghui , YU Yuanqin . Polarization effect of pump light in stimulated Raman scattering spectroscopy[J]. Chinese Journal of Quantum Electronics, 2024, 41(1): 78-86.

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受激拉曼散射光谱中泵浦光偏振效应的研究

Polarization effect of pump light in stimulated Raman scattering spectroscopy

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