Formulation of frequency stability limited by laser intrinsic noise in feedback systems.
Formulation of frequency stability limited by laser intrinsic noise in feedback systems.
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DOI：
10.1364/ao.48.000429
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发表时间：
2009-01
期刊：
影响因子：
1.9
通讯作者：
T. Hori;A. Araya;S. Moriwaki;N. Mio
中科院分区：
文献类型：
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作者：
T. Hori;A. Araya;S. Moriwaki;N. Mio
我们研究了激光源的调幅 (AM) 噪声和调相 (PM) 噪声对稳频系统中频率稳定性的影响。我们估计了激光二极管频率稳定系统的频率稳定性并评估了降噪技术（多普勒趋势减法）的功效，其中使用调制传递光谱中使用的技术来减少通过参考气室的 PM 到 AM 噪声转换所产生的增强强度噪声。为了评估激光器的固有噪声与其频率稳定性之间的关系，除了测量艾伦标准偏差之外，我们还进行了噪声频谱测量并制定了频率稳定性。结果发现，多普勒趋势相减方法有效地去除了PM转AM转换中产生的额外噪声，并且在反馈带宽内，频率稳定性比没有该方法的情况好1个数量级。
We investigated the influence of amplitude modulation (AM) noise and phase modulation (PM) noise of a laser source on the frequency stability in frequency stabilization systems. We estimated the frequency stability and evaluated the efficacy of a noise reduction technique (the Doppler-trend subtraction method) of a laser diode frequency stabilization system, where enhanced intensity noise arising from PM-to-AM noise conversion through a reference gas cell is reduced using the technique employed in modulation transfer spectroscopy. To evaluate the relationship between the laser's intrinsic noise and its frequency stability, we performed noise spectrum measurements and formulated frequency stability in addition to measuring Allan standard deviation. As a result, it is found that the extra noise generated in PM-to-AM conversion is efficiently removed by the Doppler-trend subtraction method and that within the feedback bandwidth, the frequency stability becomes 1 order of magnitude better than that without the method.