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| 基于GaAs晶体的微小振动非线性干涉测量 | |
| 引用本文： | 高晓婧,张斌,晏斌,冯其波.基于GaAs晶体的微小振动非线性干涉测量[J].中国激光,2012,39(s1):108012. |
| 作者姓名： | 高晓婧 张斌 晏斌 冯其波 |
| 作者单位： | 高晓婧:北京交通大学理学院, 北京 100044 张斌:北京交通大学理学院, 北京 100044 晏斌:北京交通大学理学院, 北京 100044 冯其波:北京交通大学理学院, 北京 100044 |
| 基金项目： | 国家自然科学基金(60878054)和中央高校基本科研业务费专项资金(2009JBZ015)资助课题。 |
| 摘 要： | 研究了一种基于GaAs晶体非稳态光感生电动势效应的非线性激光干涉振动测量系统，以固体激光器为光源，以零差干涉光路进行测量。信号光被一定频率微小振幅振动调制后与参考光在GaAs晶体表面发生干涉，根据光感生电动势效应，高于一定的截止频率，GaAs晶体将产生正比于振动幅值的交变电流信号，从而进行振动测量。对影响输出光感生电流的主要因素进行了实验研究，包括干涉条纹空间频率及GaAs电极间距，确定了最佳工作条件。将该系统的测量结果与商用测振仪的测量结果进行了比较，结果一致。 |
| 关 键 词： | 测量 非线性干涉测量 微小振动 GaAs晶体 光感生电动势 |
| 收稿时间： | 2011/7/13 |
Micro-Vibration Interferometry Based on Nonlinear Crystal of GaAs |
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| Abstract: | Homodyne interferometry based on nonlinear GaAs crystal for micro-vibration measurement is investigated by conducting an experiment. In the interferometer that with 532 nm laser, signal beam is modulated by a vibrating mirror and interfers with reference beam on the surface of GaAs crystal. The interferometric signal produces photo-induced current that relates to vibration amplitude when vibration frequency is beyond cut-off frequency of GaAs crystal. Influences of spatial frequency of interferometric fringes and electrode space of GaAs crystal on the photo-induced current of the GaAs crystal are studied and the optimum parameters are obtained. Experimental results are compared with those from a commercial vibration measurement instrument and coincided well. |
| Keywords: | measurement nonlinear interferometric measurement micro-vibration GaAs crystal photo-electromotive force |
