| 激光回馈纳米级宽度干涉条纹 |
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| 引用本文： | 张书练,费力刚,刘维新.激光回馈纳米级宽度干涉条纹[J].红外与激光工程,2008,37(2):208-211. |
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| 作者姓名： | 张书练 费力刚 刘维新 |
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| 作者单位： | 清华大学精密测试技术及仪器国家重点实验室,北京,100084 |
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| 摘 要： | 一般的干涉现象为“反射镜每移动半个波长，出现一个干涉条纹”。介绍了利用激光回馈获得纳米级宽度干涉条纹的方法。系统构成:He-Ne激光器，使用近于全反射的球面介质镜作激光器的回馈镜，且该回馈镜法线和激光束夹分量级的小角度。回馈镜沿激光束位移移动时，激光器的功率发生周期类正旋波动，即产生回馈干涉条纹。回馈镜离激光器越近，条纹越窄，以至于半波长位移中出现40个条纹。对波长为632.8 nm的He-Ne激光器而言，每个条纹宽度为7.91 nm。同时，当回馈镜的运动方向发生变化时，激光的偏振态将在两个正交的方向之间发生跳变。利用此效应，可以实现纳米分辨位移测量和回馈镜运动方向的识别。
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| 关 键 词： | 干涉条纹 激光回馈 位移测量 判向 |
| 文章编号： | 1007-2275(2008)02-0208-04 |
| 收稿时间： | 2007/6/23 |
| 修稿时间： | 2007年6月23日 |
Nano-width interference fringes of laser feedback |
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| ZHANG Shu-lian,FEI Li-gang,LIU Wei-xin.Nano-width interference fringes of laser feedback[J].Infrared and Laser Engineering,2008,37(2):208-211. |
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| Authors: | ZHANG Shu-lian FEI Li-gang LIU Wei-xin |
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| Affiliation: | State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084,China |
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| Abstract: | The traditional interference phenomenon is that “an interference fringe occurs when the reflective mirror moves by a 1/2 wavelength length”. The method of getting the nano-width interference fringes was introduced. The experimental setup was made of that: He-Ne laser, a concave mirror with nearly full reflectivity as the feedback mirror, whose normal had a small angle of minutes with the laser output beam. When the mirror had a displacement along the beam, the beam intensity would be modulated in sine, i.e. the feedback fringes occured. The further the mirror from the laser was, the narrower the fringes were. So that there were 40 fringes in half-wave displacement of the mirror,and one fringe corresponded to 7.91 nm for 632.8 nm He-Ne laser wavelength. At the same time, once the mirror changed its displacement direction, the polarization of the laser beam would rotate by 90°, i.e. the polarization had a jumping. On this effect, the nano meter displacement measurement and direction judgment can be realized. |
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| Keywords: | Interference fringes Laser feedback Displacement measurement Direction distinguishability |
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