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Fiber-coupled, Littrow-grating cavity displacement sensor

机译:光纤耦合利特罗光栅腔位移传感器

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摘要

We have demonstrated a compact, optical-fiber-fed, optical displacement sensor utilizing a Littrow-mounted diffraction grating to form a low-finesse Fabry-Perot cavity. Length changes of the cavity are read out via the Pound-Drever-Hall rf modulation technique at 925 MHz. The sensor has a nominal working distance of 2 cm and a total dynamic range of 160 nm. The displacement noise floor was less than 3 X 10~(-10) m/(Hz)~(1/2) above 10~(-2) Hz, limited by the frequency drift of the reference laser. A frequency-stabilized laser would reduce the noise floor to below 10~(-12) m/(Hz)~(1/2). The use of a 925 MHz modulation frequency demonstrates high-precision readout of a low-finesse compact resonant cavity.
机译:我们已经展示了一种紧凑的,由光纤供电的光学位移传感器,该传感器利用安装在Littrow上的衍射光栅形成了低精细的Fabry-Perot腔。腔体的长度变化通过925 MHz的Pound-Drever-Hall rf调制技术读出。该传感器的标称工作距离为2 cm,总动态范围为160 nm。位移本底噪声小于10〜(-2)Hz以上的3 X 10〜(-10)m /(Hz)〜(1/2),受参考激光器的频率漂移限制。稳频激光器可以将本底噪声降低到10〜(-12)m /(Hz)〜(1/2)以下。 925 MHz调制频率的使用证明了低精巧紧凑谐振腔的高精度读数。

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