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13 March 2024 RF-enabled frequency combs in ring quantum cascade lasers
Ina Heckelmann, Mathieu Bertrand, Alexander Dikopoltsev, Mattias Beck, Giacomo Scalari, Jérôme Faist
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Proceedings Volume PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; PC1286904 (2024) https://doi.org/10.1117/12.3002875
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
We demonstrate that resonant phase-modulation of circular Quantum Cascade Laser cavities gives rise to a novel kind of frequency comb, that is remarkably stable, fully tunable and broadband. When the backscattering in such ring cavities is sufficiently low, unidirectional lasing in the free-running device yields single-mode emission. As soon as resonant RF injection is enabled, the spectrum continuously and predictably broadens to span up to 100 cm-1 with nearly-flatted topped spectra. The bandwidth of the resulting comb is fully governed by the depth of the modulation and reaches the fundamental limit dictated by dispersion.
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Ina Heckelmann, Mathieu Bertrand, Alexander Dikopoltsev, Mattias Beck, Giacomo Scalari, and Jérôme Faist "RF-enabled frequency combs in ring quantum cascade lasers", Proc. SPIE PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, PC1286904 (13 March 2024); https://doi.org/10.1117/12.3002875
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KEYWORDS
Quantum cascade lasers
Frequency combs
Dispersion
Mid-IR
Backscatter
Carrier dynamics
Fabry–Perot interferometers
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