Lin X, Hartman M T, Zhang S, Seidelin S, Fang B, Le Coq Y
Opt Express. 2023 Nov 6;31(23):38475-38493. doi: 10.1364/OE.500077.
The agile generation and control of multiple optical frequency modes combined with the realtime processing of multi-mode data provides access to experimentation in domains such as optomechanical systems, optical information processing, and multi-mode spectroscopy. The latter, specifically spectroscopy of spectral-hole burning (SHB), has motivated our development of a multi-mode heterodyne laser interferometric scheme centered around a software-defined radio platform for signal generation and processing, with development in an entirely open-source environment. A challenge to SHB is the high level of shot noise due to the laser power constraint imposed by the spectroscopic sample. Here, we have demonstrated the production, detection, and separation of multiple optical frequency modes to the benefit of optical environment sensing for realtime phase noise subtraction as well as shot noise reduction through multi-mode averaging. This has allowed us to achieve improved noise performance in low-optical-power interferometry. Although our target application is laser stabilization via SHB in cryogenic temperature rare-earth doped crystals, these techniques may be employed in a variety of different contexts.
多种光学频率模式的灵活生成与控制，结合多模数据的实时处理，使得在诸如光机械系统、光学信息处理和多模光谱学等领域进行实验成为可能。后者，特别是光谱烧孔（SHB）光谱学，推动了我们围绕用于信号生成和处理的软件定义无线电平台开发多模外差激光干涉测量方案，且该方案是在完全开源的环境中开发的。SHB面临的一个挑战是由于光谱样品施加的激光功率限制导致的高水平散粒噪声。在此，我们展示了多种光学频率模式的产生、检测和分离，这有利于光学环境传感，以实现实时相位噪声减法以及通过多模平均降低散粒噪声。这使我们能够在低光功率干涉测量中实现更好的噪声性能。尽管我们的目标应用是通过低温稀土掺杂晶体中的SHB实现激光稳定，但这些技术可应用于各种不同的场景。
