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arXiv 2404.07597physics.opticsphysics.ins-det
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采用模式匹配外差传感方案的光学腔表征

Optical cavity characterization with a mode-matched heterodyne sensing scheme

Aaron D. Spector, Todd Kozlowski

AI总结:

本研究提出一种基于谐振本振激光与辅助探测激光两端耦合的外差传感技术,用于光学腔复反射率测量,可不受空间耦合影响并在腔本征模原位获取结果,在19米腔上实现了百万分之几精度的镜透射率及往返损耗测量。

摘要:

我们介绍了一种利用谐振本振激光器和辅助探测激光器测量光学腔复反射率的技术,二者分别通过光学腔的两端耦合。随后采用外差传感方案,观测直接反射场与经远端镜注入的腔透射场之间的干涉拍频的相位和振幅。由于本振激光器在与探测激光器发生干涉前必须穿过光学腔,这些测量结果不仅不受任一激光器与光学腔空间耦合情况的影响,还能在光学腔本征模的原位位置获取。我们在一个19米长的光学腔上验证了该技术,可测量每块反射镜各自的透射率以及往返光学损耗,精度可达百万分之几。

英文摘要:

We describe a technique for measuring the complex reflectivity of an optical cavity with a resonant local oscillator laser and an auxiliary probe laser, each coupled via opposite ends of the cavity. A heterodyne sensing scheme is then used to observe the phase and amplitude of the interference beat-note between the promptly reflected field and the cavity transmitted field injected through the far mirror. Since the local oscillator laser must pass through the cavity before interfering with the probe laser these measurements are not only independent of the spatial coupling of either laser to the cavity, but also obtained at the in-situ position of the cavity Eigenmode. This technique was demonstrated on a 19 m cavity to measure the individual transmissivities of each of the mirrors as well as the round trip optical losses to an accuracy of several parts per million.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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