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Experimental validation of a simple approximation to determine the linewidth of a laser from its frequency noise spectrum

机译：简单近似的实验验证，可从其频率噪声频谱确定激光的线宽

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摘要

Laser frequency fluctuations can be characterized either comprehensively by the frequency noise spectrum or in a simple but incomplete manner by the laser linewidth. A formal relation exists to calculate the linewidth from the frequency noise spectrum, but it is laborious to apply in practice. We recently proposed a much simpler geometrical approximation applicable to any arbitrary frequency noise spectrum. Here we present an experimental validation of this approximation using laser sources of different spectral characteristics. For each of them, we measured both the frequency noise spectrum to calculate the approximate linewidth and the actual linewidth directly. We observe a very good agreement between the approximate and directly measured linewidths over a broad range of values (from kilohertz to megahertz) and for significantly different laser line shapes.
机译：可以通过频率噪声频谱全面地表征激光频率波动，也可以通过激光线宽以简单但不完整的方式表征激光频率波动。存在根据频率噪声频谱计算线宽的形式关系，但是在实践中很难进行应用。我们最近提出了一种适用于任何任意频率噪声频谱的简单得多的几何近似方法。在这里，我们介绍了使用不同光谱特征的激光源对这种近似进行实验验证。对于它们中的每一个，我们都测量了频率噪声频谱以直接计算近似线宽和实际线宽。我们观察到，在很宽的数值范围（从千赫兹到兆赫兹）中，对于近似不同的激光线形，近似和直接测量的线宽之间有着很好的一致性。

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