延迟自外差法提取激光器频率噪声的一种改进方法
Refined method to extract frequency-noise components of lasers by delayed self-heterodyne
摘要：
量化激光器稳定性的一个重要指标是其频率噪声（FN）。该度量产生关于线宽和噪声分量的信息，这限制了其用于高精度目的，例如相干通信。它的实验测定依赖于具有挑战性的光学相位测量，为此已经开发了专用的商业仪器。相比之下，这项工作提出了一个简单的和具有成本效益的方法提取FN功能采用延迟自外差（DSH）设置。使用比激光的相干长度短得多的延迟长度，DSH迹线揭示了与用商业仪器测量的FN功率谱密度（PSD）的对应关系。结果发现，多个激光器，在强烈的抖动音频率低于0.2%的差异
英文摘要：
An essential metric to quantify the stability of a laser is its frequency noise (FN). This metric yields information on the linewidth and on noise components which limit its usage for high precision purposes such as coherent communication. Its experimental determination relies on challenging optical phase measurements, for which dedicated commercial instruments have been developed. In contrast, this work presents a simple and cost-effective method for extracting FN features employing a delayed self-heterodyne (DSH) setup. Using delay lengths much shorter than the coherence length of the laser, the DSH trace reveals a correspondence with the FN power spectral density (PSD) measured with commercial instruments. Results are found for multiple lasers, with discrepancies in intense dither tone frequencies below 0.2 percent
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