We report on achieving tuned single mode operation of a multimode semiconductor laser by coupling it to a very-short external cavity with selective feedback. We show that the induced uniform feedback light from the very-short external cavity can induce single-mode oscillation over a broad range of optical feedback. Then by applying selective external to the optimum settings of the single-mode oscillation, we predict tuning of the single-mode output over a wavelength range of ~ 20 nm by detuning the peak wavelength of optical feedback from the central wavelength of the modal gain. The study is based on modeling of the dynamics of multimode semiconductor laser subject to selective optical feedback. The model takes into account mechanisms of both self- and cross-modal gain suppression, and the study is concerned with the very-short external cavity that corresponds to stable continuous-wave (CW) operation.

中文翻译：

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感应法布里-珀罗半导体激光器与具有选择性光反馈的超短腔耦合的可调谐单模操作

我们报告了通过将其耦合到具有选择性反馈的非常短的外部腔体来实现多模半导体激光器的调谐单模操作。我们表明，从非常短的外部腔体产生的均匀反馈光会在很宽的光反馈范围内引起单模振荡。然后，通过将选择性外部应用到单模振荡的最佳设置，我们通过从模态增益的中心波长失谐光反馈的峰值波长，来预测在〜20 nm波长范围内对单模输出的调谐。该研究基于对具有选择性光反馈的多模半导体激光器的动力学建模。该模型考虑了自模和互模增益抑制的机制，