Exploring frequency comb generation in optically injected ring quantum cascade lasers

Md Istiak Khan; Zhenyang Xiao; Sadhvikas J. Addamane; David Burghoff

doi:10.1117/12.3003180

12 March 2024 Exploring frequency comb generation in optically injected ring quantum cascade lasers

Md Istiak Khan, Zhenyang Xiao, Sadhvikas J. Addamane, David Burghoff

Proceedings Volume 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; 1286903 (2024) https://doi.org/10.1117/12.3003180
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Quantum Cascade Lasers (QCLs) have immense potential for generating chip-scale frequency combs in the mid-infrared and terahertz spectral regions. In this work, we demonstrate the formation of frequency combs within ring terahertz QCLs using optical injection from a Distributed Feedback (DFB) laser. By carefully selecting a DFB design frequency that aligns with the ring cavity modes (around 3.3 THz) and employing a bus waveguide for light injection, we show that combs can be selectively formed and controlled within the ring cavity. Numerical modeling suggests that the observed comb formation is frequency-modulated in nature, with the optical injection acting as a trigger. Furthermore, we demonstrate the ring cavity's ability to function as a filter, a feature that could hold significant value for terahertz photonic integrated circuits. Our findings highlight the promise of waveguide couplers as a robust approach for injecting and extracting radiation from ring terahertz comb and offer exciting possibilities for generation of new comb states in the terahertz domain, including frequency-modulated waves, solitons, and more.

Conference Presentation

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

Citation Download Citation

Md Istiak Khan, Zhenyang Xiao, Sadhvikas J. Addamane, and David Burghoff "Exploring frequency comb generation in optically injected ring quantum cascade lasers", Proc. SPIE 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, 1286903 (12 March 2024); https://doi.org/10.1117/12.3003180

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