Harmonic modelocking of terahertz quantum cascade lasers

Sukhdeep S. Dhillon

doi:10.1117/12.2595350

1 August 2021 Harmonic modelocking of terahertz quantum cascade lasers

Sukhdeep S. Dhillon

Proceedings Volume 11827, Terahertz Emitters, Receivers, and Applications XII; 1182709 (2021) https://doi.org/10.1117/12.2595350
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

The use of fundamental modelocking to generate short terahertz (THz) pulses and THz frequency combs from semiconductor lasers has become a routine affair, using quantum cascade lasers (QCLs) as a gain medium. Here, using time-resolved THz techniques, we show the first of demonstration harmonic injection and mode- locking in which THz QCLs are modulated at the harmonics of the round-trip frequency. This generates multiple THz pulses per round trip in both active and self-starting harmonic regimes. This behaviour is supported by time-resolved Maxwell-Bloch simulations of induced gain and loss in the system. This work exploits the inherent ultrafast dynamics of QCLs and opens up new avenues in THz pulse generation.

Conference Presentation

Citation Download Citation

Sukhdeep S. Dhillon "Harmonic modelocking of terahertz quantum cascade lasers", Proc. SPIE 11827, Terahertz Emitters, Receivers, and Applications XII, 1182709 (1 August 2021); https://doi.org/10.1117/12.2595350

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