Theoretical investigation of harmonic frequency comb formation dynamics in defect-engineered THz quantum cascade lasers

Lukas Seitner; Johannes Popp; Michael A. Schreiber; Michael Haider; Christian Jirauschek

doi:10.1117/12.3017516

18 June 2024 Theoretical investigation of harmonic frequency comb formation dynamics in defect-engineered THz quantum cascade lasers

Lukas Seitner, Johannes Popp, Michael A. Schreiber, Michael Haider, Christian Jirauschek

Author Affiliations +

Proceedings Volume 12994, Terahertz Photonics III; 1299406 (2024) https://doi.org/10.1117/12.3017516
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Terahertz (THz) quantum cascade lasers (QCL) may operate as harmonic frequency combs, exhibiting a mode-separation of multiple times the round trip frequency. This work aims to shed light on the coupled field-electron dynamics that lead to harmonic mode-locking in defect-engineered THz QCLs. Therefore, we use the Maxwell-Bloch equations describing a medium of two-level quantum systems interacting with the electric field in the laser cavity. We find that both the amplitude and phase of the electric field are coupled to the introduced defects, and the system quickly reaches a locked state. Despite the presence of the reflectors, spatial hole burning is necessary to enable multimode operation.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lukas Seitner, Johannes Popp, Michael A. Schreiber, Michael Haider, and Christian Jirauschek "Theoretical investigation of harmonic frequency comb formation dynamics in defect-engineered THz quantum cascade lasers", Proc. SPIE 12994, Terahertz Photonics III, 1299406 (18 June 2024); https://doi.org/10.1117/12.3017516

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