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- Title
Controlling and Phase‐Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning.
- Authors
Consolino, Luigi; Campa, Annamaria; De Regis, Michele; Cappelli, Francesco; Scalari, Giacomo; Faist, Jérôme; Beck, Mattias; Rösch, Markus; Bartalini, Saverio; De Natale, Paolo
- Abstract
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.
- Subjects
TERAHERTZ materials; QUANTUM cascade lasers; OPTICAL frequency conversion; FREQUENCY tuning; LIGHT emitting diodes; REFRACTIVE index; DEGREES of freedom
- Publication
Laser & Photonics Reviews, 2021, Vol 15, Issue 6, p1
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.202000417