Modeling of short pulse generation in THz quantum cascade lasers with embedded graphene saturable absorber

Lukas Seitner; Michael Haider; Sukhdeep S. Dhillon; Miriam S. Vitiello; Christian Jirauschek

doi:10.1117/12.3002788

8 March 2024 Modeling of short pulse generation in THz quantum cascade lasers with embedded graphene saturable absorber

Lukas Seitner, Michael Haider, Sukhdeep S. Dhillon, Miriam S. Vitiello, Christian Jirauschek

Proceedings Volume 12895, Quantum Sensing and Nano Electronics and Photonics XX; 128950J (2024) https://doi.org/10.1117/12.3002788
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Passive mode-locking of lasers enables a compact way of stable optical pulse generation and is thus of high interest in research and application. Quantum cascade lasers (QCLs) emit radiation in the mid-infrared or terahertz (THz) spectral region and exhibit gain recovery on picosecond timescales. As the cavity round trip time is typically some tens of picoseconds, passively mode-locked operation of QCLs is undoubtedly challenging to achieve. However, short pulses from a THz QCL were recently observed by embedding a graphene saturable absorber into the top contact of the cavity. This contribution presents a model of the dynamic interplay between electric field, gain, and absorber, revealing that pulse formation and stability are possible in a narrow bias range, enhanced by spatial hole burning.

Conference Presentation

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

Citation Download Citation

Lukas Seitner, Michael Haider, Sukhdeep S. Dhillon, Miriam S. Vitiello, and Christian Jirauschek "Modeling of short pulse generation in THz quantum cascade lasers with embedded graphene saturable absorber", Proc. SPIE 12895, Quantum Sensing and Nano Electronics and Photonics XX, 128950J (8 March 2024); https://doi.org/10.1117/12.3002788

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