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arXiv 1609.09768physics.optics
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频移光反馈对laser噪声功率谱的非线性修正

Nonlinear modification of the laser noise power spectrum induced by a frequency-shifted optical feedback

Eric Lacot, Bahram Houchmandzadeh, Vadim Girardeau, Olivier Hugon, Olivier Jacquin

摘要:

本文研究了频移光反馈作用下激光器的稳态(即拍频调制信号)和瞬态(即激光量子噪声)动力学之间的非线性耦合。我们展示了如何在不同的光反馈条件下的噪声功率谱,更具体地说,激光器的弛豫振荡频率的修改。具体来说,我们研究的影响(i)返回到激光腔的光量和(ii)之间的频率偏移和固有弛豫频率的初始失谐。本文给出了弛豫频率与拍频信号强度的关系,以及噪声功率谱的形状,给出了非线性激光动力学的传递调制函数(即放大增益)的图象,理论预测与实验数据符合得很好,并得到了数值解的证实。

英文摘要:

In this article, we study the non-linear coupling between the stationary (i.e. the beating modulation signal) and transient (i.e. the laser quantum noise) dynamics of a laser subjected to frequency shifted optical feedback. We show how the noise power spectrum and more specifically the relaxation oscillation frequency of the laser are modified under different optical feedback condition. Specifically we study the influence of (i) the amount of light returning to the laser cavity and (ii) the initial detuning between the frequency shift and intrinsic relaxation frequency. The present work shows how the relaxation frequency is related to the strength of the beating signal and the shape of the noise power spectrum gives an image of the Transfer Modulation Function (i.e. of the amplification gain) of the nonlinear-laser dynamics.The theoretical predictions, confirmed by numerical resolutions, are in good agreements with the experimental data.

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