Gain-shaped quantum cascade laser frequency combs

Mithun Roy; Zhenyang Xiao; Sadvikhas Addamane; David Burghoff

doi:10.1117/12.3012364

13 March 2024 Gain-shaped quantum cascade laser frequency combs

Mithun Roy, Zhenyang Xiao, Sadvikhas Addamane, David Burghoff

Proceedings Volume 12912, Quantum Sensing, Imaging, and Precision Metrology II; 129120N (2024) https://doi.org/10.1117/12.3012364
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

Optical frequency combs based on quantum cascade lasers (QCLs) are promising broadband light sources in the mid-infrared and terahertz spectral regions. Their bandwidths are limited by two main parameters: dispersion, which originates from variation in the group velocity, and diffusion, which originates from variation in the gain. While dispersion has been extensively engineered, diffusion shaping has been elusive. We show that the addition of carefully engineered diffusive loss can enhance the bandwidth of QCL combs, demonstrating theoretically and experimentally that adding resonant loss to the cavity of a terahertz QCL can counteract the diffusive effect of the gain medium and allow broader bandwidth combs to form. Our results give a new degree of freedom for the creation of active chip-scale combs and can be applied to a wide array of cavity geometries and comb systems.

Conference Presentation

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

Citation Download Citation

Mithun Roy, Zhenyang Xiao, Sadvikhas Addamane, and David Burghoff "Gain-shaped quantum cascade laser frequency combs", Proc. SPIE 12912, Quantum Sensing, Imaging, and Precision Metrology II, 129120N (13 March 2024); https://doi.org/10.1117/12.3012364

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