Laser line shape and spectral density of frequency noise (9 pages)
Laser line shape and spectral density of frequency noise (9 pages)
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DOI：
10.1103/physreva.71.043809
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发表时间：
2005-04
影响因子：
2.9
通讯作者：
Guy Stéphan;T. Tam;Stéphane Blin;Pascal Besnard;Michel Tetu
中科院分区：
文献类型：
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作者：
Guy Stéphan;T. Tam;Stéphane Blin;Pascal Besnard;Michel Tetu
公开的实验结果表明，单模激光在微波范围内的特征在于频率噪声，该频率噪声基本上包括白色部分和1/f（闪烁）部分。我们从理论上证明了与这些结果相一致的谱密度（线形）是一个Voigt轮廓，它的洛伦兹部分或均匀分量与白色噪声相联系，高斯部分与1/f噪声相联系。我们测量了半导体激光器的谱线轮廓，并验证了它们可以用Voigt函数拟合。还验证了洛伦兹部分的宽度像1/P那样变化，其中P是激光功率，而高斯部分的宽度更是常数。最后，我们从理论上表明，从第一性原理，激光线的形状也描述了Voigt函数的洛伦兹部分是激光艾里函数和高斯部分源于人口噪声。
Published experimental results show that single-mode laser light is characterized in the microwave range by a frequency noise which essentially includes a white part and a 1/f (flicker) part. We theoretically show that the spectral density (the line shape) which is compatible with these results is a Voigt profile whose Lorentzian part or homogeneous component is linked to the white noise and the Gaussian part to the 1/f noise. We measure semiconductor laser line profiles and verify that they can be fit with Voigt functions. It is also verified that the width of the Lorentzian part varies like 1/P where P is the laser power while the width of the Gaussian part is more of a constant. Finally, we theoretically show from first principles that laser line shapes are also described by Voigt functions where the Lorentzian part is the laser Airy function and the Gaussian part originates from population noise.