High resolution polarization nulling measurement system with magneto-optical modulator

被引:0
|
作者
Zhang, Jian-Hua [1 ]
Liu, Li-Guo [1 ]
Zhu, He-Nian [1 ]
Lin, Yu-Xia [1 ]
机构
[1] Dept. of Phys., Tsinghua Univ., Beijing 100084, China
关键词
Ellipsometry - Light polarization;
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学科分类号
摘要
The segment of automatic ellipsometer in document [1]-the measurement of polarization nulling has been improved. By using Terbium special glass (Verdet constant=0.31 min/Oe&middotcm) as modulator material, a new type of magneto-optical modulator and driver circuit have been designed and constructed. Polarized Light is modulated by DC and AC, using ultra-low noise frequency-selective amplifier and lock-in amplifier, the repeatability error S3 of nulling is not greater then 0.0004°.
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页码:1041 / 1042
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