论文标题
使用延迟线消除高频宽带激光相位噪声
High-frequency broadband laser phase noise cancellation using a delay line
论文作者
论文摘要
激光相噪声仍然是许多实验设置的限制因素，包括计量，时间保持以及量子光学。迄今为止，此问题以低频解决，范围从远低于1 Hz到最大100 kHz。然而，各种实验，例如涉及纳米力学膜谐振器的实验对较高频率的噪声高度敏感，范围为100 kHz至10 MHz，例如纳米力学膜谐振器。在这里，我们采用了优化的光纤延迟线干涉仪，以在1.5 MHz左右的频率下取消激光相噪声。我们在300 kHz范围内的频带中降低了降噪功能，并在所需的频率下降低了10 dB的峰值，并以Ti：al $ _2 $ o $ _3 $ laser的峰值低于-160 dB（rad $^2 $/hz）。这些结果提供了一种方便的降噪技术，以实现机械运动的深层冷却。
Laser phase noise remains a limiting factor in many experimental settings, including metrology, time-keeping, as well as quantum optics. Hitherto this issue was addressed at low frequencies, ranging from well below 1 Hz to maximally 100 kHz. However, a wide range of experiments, such as, e.g., those involving nanomechanical membrane resonators, are highly sensitive to noise at higher frequencies in the range of 100 kHz to 10 MHz, such as nanomechanical membrane resonators. Here we employ a fiber-loop delay line interferometer optimized to cancel laser phase noise at frequencies around 1.5 MHz. We achieve noise reduction in 300 kHz-wide bands with a peak reduction of more than 10 dB at desired frequencies, reaching phase noise of less than -160 dB (rad$^2$/Hz) with a Ti:Al$_2$O$_3$ laser. These results provide a convenient noise reduction technique to achieve deep ground-state cooling of mechanical motion.
