Cullen Torrey, Aronson Scott, Pagano Ron, Trad Nery Marina, Cain Henry, Cripe Jonathon, Cole Garrett D, Sharifi Safura, Aggarwal Nancy, Willke Benno, Corbitt Thomas
Opt Lett. 2022 Jun 1;47(11):2746-2749. doi: 10.1364/OL.456535.
Metrology experiments can be limited by the noise produced by the laser involved via small fluctuations in the laser's power or frequency. Typically, active power stabilization schemes consisting of an in-loop sensor and a feedback control loop are employed. Those schemes are fundamentally limited by shot noise coupling at the in-loop sensor. In this Letter, we propose to use the optical spring effect to passively stabilize the classical power fluctuations of a laser beam. In a proof of principle experiment, we show that the relative power noise of the laser is stabilized from approximately 2 × 10 Hz to a minimum value of 1.6 × 10 Hz, corresponding to the power noise reduction by a factor of 125. The bandwidth at which stabilization occurs ranges from 400 Hz to 100 kHz. The work reported in this Letter further paves the way for high power laser stability techniques which could be implemented in optomechanical experiments and in gravitational wave detectors.
计量实验可能会受到激光产生的噪声的限制，这些噪声源于激光功率或频率的微小波动。通常，会采用由环路内传感器和反馈控制回路组成的有源功率稳定方案。然而，这些方案从根本上受到环路内传感器散粒噪声耦合的限制。在本信函中，我们提议利用光学弹簧效应来被动稳定激光束的经典功率波动。在原理验证实验中，我们表明激光的相对功率噪声从约2×10⁻³Hz稳定到最小值1.6×10⁻⁵Hz，相当于功率噪声降低了125倍。发生稳定的带宽范围为400Hz至100kHz。本信函中报道的工作进一步为可在光机械实验和引力波探测器中实现的高功率激光稳定性技术铺平了道路。
