Controlling and Phase-Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning,Laser & Photonics Reviews

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Controlling and Phase-Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-04-23 , DOI: 10.1002/lpor.202000417
Luigi Consolino ₁ , Annamaria Campa ₁ , Michele De Regis ₁ , Francesco Cappelli ₁ , Giacomo Scalari ₂ , Jérôme Faist ₂ , Mattias Beck ₂ , Markus Rösch ₂ , Saverio Bartalini ₁ , Paolo De Natale ₁

Affiliation

Full phase control of terahertz (THz)-emitting quantum cascade laser (QCL) combs has recently been demonstrated, opening new perspectives for even the most demanding applications. In this framework, simplifying the set-ups for control of these devices will help to accelerate their spreading in many fields. This study reports a new way to control the emission frequencies of a THz QCL comb by small optical frequency tuning (SOFT), using a very simple experimental setup, exploiting the incoherent emission of an ordinary white light-emitting diode. The slightly perturbative regime accessible in these conditions allows tweaking the complex refractive index of the semiconductor without destabilizing the broadband laser gain. The SOFT actuator is characterized and compared to another actuator, the QCL driving current. The suitability of this additional degree of freedom for frequency and phase stabilization of a THz QCL comb is shown and perspectives are discussed.

中文翻译：

小光频调谐控制和锁相太赫兹量子级联激光频率梳

最近证明了太赫兹 (THz) 发射量子级联激光器 (QCL) 梳的全相位控制，为最苛刻的应用开辟了新的前景。在这个框架中，简化这些设备的控制设置将有助于加速它们在许多领域的传播。这项研究报告了一种通过小光频调谐 (SOFT) 控制太赫兹 QCL 梳子发射频率的新方法，使用非常简单的实验装置，利用普通白光发光二极管的非相干发射。在这些条件下可访问的轻微微扰状态允许在不破坏宽带激光增益的情况下调整半导体的复折射率。SOFT 执行器的特点是与另一个执行器 QCL 驱动电流进行比较。

更新日期：2021-06-11

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