Coherent mode locking in a two-section laser with fast gain and absorber

IF 2 3区物理与天体物理 Q3 OPTICS Applied Physics B Pub Date : 2024-09-22 DOI:10.1007/s00340-024-08317-7

Rostislav Arkhipov, Olga Diachkova, Anton Pakhomov, Mikhail Arkhipov, Nikolay Rosanov, Bogdan Zhmud, Rustam Khabibullin

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Abstract

Coherent mode locking is based on the formation of \(2\pi\) pulses of self-induced transparency in the absorbing medium and \(\pi\) pulses in the amplifying medium. In this regime it becomes possible to generate ultrashort laser pulses down to one oscillation cycle with a pulse duration being much shorter than the polarization relaxation time \(T_2\) of the amplifying and absorbing medium. In this article a two-section laser model with a ring resonator based on absorbing and amplifying medium with short relaxation times has been applied. We have demonstrated a self-starting regime of coherent mode locking with picosecond and femtosecond laser pulses using numerical simulations for the given model. In addition, we have shown that there is a significant influence of generation frequency detuning on laser pulse duration and intensity. Moreover, we have compared our numerical results with an analytical model of a coherent mode-locked laser based on the area theorem. We believe that the findings of this work can open a pathway towards the practical application of mode locking in mid-IR and THz quantum cascade lasers.

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具有快速增益和吸收器的双段激光器中的相干模式锁定

相干模式锁定是基于在吸收介质中形成自感应透明脉冲和在放大介质中形成自感应透明脉冲。在这种情况下，就有可能产生低至一个振荡周期的超短激光脉冲，其脉冲持续时间远远短于放大和吸收介质的偏振弛豫时间（T_2）。本文应用了一种基于短弛豫时间吸收和放大介质的环形谐振器的双段激光模型。通过对该模型的数值模拟，我们证明了皮秒和飞秒激光脉冲相干模式锁定的自启动机制。此外，我们还证明了产生频率失谐对激光脉冲持续时间和强度的显著影响。此外，我们还将数值结果与基于面积定理的相干锁模激光器分析模型进行了比较。我们相信，这项工作的发现可以为中红外和太赫兹量子级联激光器中模式锁定的实际应用开辟一条道路。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.