Birefringence measurement of liquid crystals based on laser feedback effect

被引：0
|
作者：
Li J. [1 ,2 ]
Tan Y. [1 ]
Wu J. [3 ]
Zhang S. [1 ]
机构：
[1] State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing
[2] School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing
[3] Castech Inc., Fuzhou
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2017年 / 46卷 / 03期
关键词：
Anisotropy external cavity feedback; Birefringence; Laser feedback effect; Liquid crystals; Phase retardation;
D O I：
10.3788/IRLA201746.0306003
中图分类号：
学科分类号：
摘要：
The precise measurement of the birefringence in the liquid crystals has significant meaning for practical applications. The working principles of the liquid crystals were analyzed. The laser anisotropy external cavity feedback system was built based on the laser feedback effect. The anisotropy of the liquid crystals under different voltages was measured. The measurement results show that the accuracy of the laser anisotropy external cavity feedback system is within 0.3°; By imposing different voltage from 0 to 24 V, the birefringence changes from 2.74×10-1 to 2.39×10-3, corresponding to the large range phase retardation of 460° to 5°. With the voltage in the range of 0.7 V to 2 V, the relationship between the voltage and the birefringence is linear and its linearity is better than 95.5%. The liquid crystals can provide stable phase retardation, the short-term repeatability is better than 0.52° and the long-term repeatability is better than 4.5°. © 2017, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
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