Jian Pu, Pinel Olivier, Fabre Claude, Lamine Brahim, Treps Nicolas
Laboratoire Kastler Brossel, Université Pierre et Marie Curie-Paris 6, ENS, CNRS, Paris, France.
Opt Express. 2012 Nov 19;20(24):27133-46. doi: 10.1364/OE.20.027133.
We propose a direct and real-time displacement measurement using an optical frequency comb, able to compensate optically for index of refraction variations due to atmospheric parameters. This scheme could be useful for applications requiring stringent precision over a long distance in air, a situation where dispersion becomes the main limitation. The key ingredient is the use of a mode-locked laser as a precise source for multi-wavelength interferometry in a homodyne detection scheme. By shaping temporally the local oscillator, one can directly access the desired parameter (distance variation) while being insensitive to fluctuations induced by parameters of the environment such as pressure, temperature, humidity and CO2 content.
我们提出一种使用光学频率梳进行直接实时位移测量的方法，该方法能够光学补偿由于大气参数导致的折射率变化。此方案对于在空气中长距离需要严格精度的应用可能有用，在这种情况下色散成为主要限制因素。关键要素是在零差检测方案中使用锁模激光器作为多波长干涉测量的精确光源。通过对本地振荡器进行时间整形，人们可以直接获取所需参数（距离变化），同时对诸如压力、温度、湿度和二氧化碳含量等环境参数引起的波动不敏感。
