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基于弹光调制的高灵敏旋光测量

李克武 王志斌 陈友华 杨常青 张瑞

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基于弹光调制的高灵敏旋光测量

李克武, 王志斌, 陈友华, 杨常青, 张瑞

High sensitive measurement of optical rotation based on photo-elastic modulation

Li Ke-Wu, Wang Zhi-Bin, Chen You-Hua, Yang Chang-Qing, Zhang Rui
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  • 为了实现连续稳定、高速、高精度和高灵敏度的光学旋光测量, 考虑到弹光偏振调制技术具有高的调制频率、调制纯度、调制精度和良好的调制稳定度等应用优势, 设计了一种基于弹光调制的旋光测量新方案. 检测激光经起偏器、测量样品、弹光调制器和检偏器到探测器的光路设计, 使得测量系统选用较少的光学器件, 最大化地降低了光学器件可能引入的测量误差; 起偏器和检偏器偏振轴相对于弹光调制器快轴方向分别取0°和45°的光学安排, 并选择弹光调制的二倍频信号作为研究对象, 有效避免了弹光调制器剩余双折射对旋光样品测量的影响, 提高了旋光测量精确度; 将探测器输出调制信号的直流和交流分开输出, 并将交流信号进行前置放大处理, 然后再锁相输出, 进一步提高了测量灵敏度. 设计了将激光调制为圆偏光, 然后精确调节起偏器来替代样品的旋光测量验证试验, 确定了系统旋光测量的比列系数, 并且获得旋光测量灵敏度为3.15×10-7 rad, 测量精度优于0.3%. 所以, 本方案实现了较高灵敏度旋光测量, 有望应用于高灵敏旋光测量领域, 并且本方案的实验可为高灵敏旋光测量系统的定标提供参考.
    In order to realize the continuous and stable, high speed, high precise and high sensitive measurement of optical rotation, and considering the application advantages of photo-elastic polarization modulation technology with high modulation frequency, high modulation purity, high modulation accuracy and good modulation stability, a new scheme about the measurement of optical rotation based on photo-elastic modulation is presented. Probe laser orderly passes through a polarizer, the rotation sample to be measured, a photo-elastic modulator, and a analyzer, and finally reaches the detector, this system uses less optical devices than any others previously reported, so it considerably reduces the measurement error that may be introduced by the optical devices. In the detecting of light path, the polarization axes of the polarizer and analyzer are respectively adjusted with respect to the photo-elastic modulator's fast axis directions 0° and 45°, the optical arrangements make the rotation angle to be measured appear in the alternating current signal, and the photo-elastic modulator's residual birefringence only appears in the odd harmonics. Consequently, the second harmonic signal of photo-elastic modulation is selected as the object to study, which effectively avoids the influence of residual birefringence of the photo-elastic modulator on optical rotation measurement, and efficiently improves the accuracy of optical rotation measurement. What is more, the detector output signal is separated into two parts, the direct current and alternating current signal. The alternating current signal is amplified, then outputs by a lock-in amplifier, which enhances the measurement sensitivity further. A ingenious verification test experiment is done, firstly, the probe laser is modulated into circularly polarized light, and then precisely rotates the polarizer to replace the optical rotation sample. The results show that the new scheme is feasible, this experiment gives the proportion coefficient of the measurement system, the sensitivity of optical rotation measurement increasing up to 3.15× 10-7 rad, and the measurement precision exceeding 0.3%. Therefore, in this scheme achieved is a high sensitive and precise measurement of optical rotation, and it is expected to be applied to the high sensitive and precise rotation measurement. The verification test experiment designed by us can also provide a outstanding calibration reference for high sensitive rotation measurement system.
      通信作者: 王志斌, wangzhibin@nuc.edu.cn
    • 基金项目: 国家国际科技合作专项项目(批准号: 2013DFR1015, 2012DFA10680)和国家自然科学基金(批准号: 61127015)资助的课题.
      Corresponding author: Wang Zhi-Bin, wangzhibin@nuc.edu.cn
    • Funds: Project supported by the International Science and Technology Cooperation Special, China (Grant Nos. 2013DFR1015, 2012DFA10680), and the National Natural Science Foundation of China (Grant No. 61127015).
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  • [1]

    Shi S X, Liu J F, Sun Y L 2013 Electromsgntic Theory of Light (Xi'an: Xi'an Electronic and Science University press) p69 (in Chinese) [石顺祥, 刘继芳, 孙艳玲 2013 光的电磁理论 (西安:西安电子科技大学出版)第69页]

    [2]

    Li C S 2015 Acta Phys. Sin. 64 047801(in Chinese) [李长胜 2015 物理学报 64 047801]

    [3]

    Zhang B, Pan X F, Tao W D 2011 Acta Phys. Sin. 60 054214(in Chinese) [张斌, 潘雪丰, 陶卫东 2011 物理学报 60 054214]

    [4]

    Zhao Y M, Wang P J, Fang Y, Wu G Z 2012 Acta Phys. Sin. 61 240201(in Chinese) [赵彦牧, 王培杰, 方炎, 吴国祯 2012 物理学报 61 240201]

    [5]

    Sheng D, Kabcenell A, Romalis M V 2014 Phys. Rev. Lett. 113 163002

    [6]

    Fang J C, Qin J, Wan S A, Chen Y, Li R J 2013 Appl. Phys. Lett. 58 1512

    [7]

    Zeng A J, Li F Y, Zhu L L, Huang H J 2011 Appl. Opt. 50 4347

    [8]

    Wang Z B, Li K W, Zhang R, Wang L F, Wang G L 2015 Opt. Precision Eng. 23 63

    [9]

    Kemp J C 1969 J. Opt. Soc. Am. 59 950

    [10]

    Mollenauer L F, Downie D, Engstrom H, Grant W B 1969 Appl. Opt. 8 661

    [11]

    Modine F A, Major R W 1975 Appl. Opt. 14 761

    [12]

    Wang B L 1998 Proc. SPIE 3535 294

    [13]

    Dang H B, Maloof A C, Romalis M V 2010 Appl. Phys. Lett. 97 151110

    [14]

    Lu Y X, L B D 1989 Matris Optics (Dalian: Dalian University of Technology Press) pp356-357 (in Chinese) [卢亚雄, 吕百达 1989 矩阵光学 (大连: 大连理工大学出版社) 第356–357页]

    [15]

    Wang B L, Theodore C O 1999 Rev. Sci. Instrum. 70 3847

    [16]

    Wang B L, Emily Hinds, Erica Krivoy 2009 Proc. SPIE 7461 746110

    [17]

    Liao Y B 2003 Polarization Optics (Beijing: Science Press) p246 (in Chinese) [廖延彪 2003 偏振光学 (北京: 科学出版社)第246页]

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出版历程
  • 收稿日期:  2015-04-15
  • 修回日期:  2015-04-30
  • 刊出日期:  2015-09-05

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