Kwee Patrick, Willke Benno, Danzmann Karsten
Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) and Leibniz Universität Hannover, 30167 Hannover, Germany.
Appl Opt. 2009 Oct 1;48(28):5423-31. doi: 10.1364/AO.48.005423.
We demonstrate an active power stabilization of a Nd:YAG laser employing the optical ac-coupling scheme and derive its fundamental quantum limit. This limit is 3 dB better than the one encountered in traditional power stabilization schemes. In our experiment, the optical ac coupling improved the shot-noise-limited sensitivity of the stabilization photodetector by a factor of 11.2. With an independent photodetector, we measured a relative power stability of 3.7x10(-9) Hz(-1/2) at frequencies of around 200 kHz. A detailed investigation of the performance limit of our experiment revealed a novel noise source that disturbed the fundamental mode field in the optical resonator. This effect could be of relevance to many precision experiments using optical resonators.
我们展示了一种采用光学交流耦合方案的Nd:YAG激光器的有功功率稳定，并推导了其基本量子极限。该极限比传统功率稳定方案中的极限要好3 dB。在我们的实验中，光学交流耦合将稳定光探测器的散粒噪声限制灵敏度提高了11.2倍。使用独立的光探测器，我们在约200 kHz的频率下测量到相对功率稳定性为3.7×10⁻⁹ Hz⁻¹/²。对我们实验性能极限的详细研究揭示了一种干扰光学谐振器中基模场的新型噪声源。这种效应可能与许多使用光学谐振器的精密实验相关。
