Otabe Sotatsu, Komori Kentaro, Harada Ken-Ichi, Suzuki Kaido, Michimura Yuta, Somiya Kentaro
Opt Express. 2022 Nov 7;30(23):42579-42593. doi: 10.1364/OE.474621.
Intracavity squeezing is a promising technique that may improve the sensitivity of gravitational wave detectors and cool optomechanical oscillators to the ground state. However, the photothermal effect may modify the occurrence of optomechanical coupling due to the presence of a nonlinear optical crystal in an optical cavity. We propose a novel method to predict the influence of the photothermal effect by measuring the susceptibility of the optomechanical oscillator and identifying the net optical spring constant and photothermal absorption rate. Using this method, we succeeded in precisely estimating parameters related to even minor photothermal effects, which could not be measured using a previously developed method.
腔内压缩是一种很有前景的技术，它可能会提高引力波探测器的灵敏度，并将光机械振荡器冷却到基态。然而，由于光学腔中存在非线性光学晶体，光热效应可能会改变光机械耦合的发生情况。我们提出了一种新方法，通过测量光机械振荡器的磁化率并确定净光学弹簧常数和光热吸收率来预测光热效应的影响。使用这种方法，我们成功地精确估计了与即使是微小的光热效应相关的参数，而这些参数是使用先前开发的方法无法测量的。
