Bright-dark solitons in a hybridized frequency comb

Theodore P. Letsou; Dmitry Kazakov; Pawan Ratra; Lorenzo L. Columbo; Sandro Dal Cin; Nikola Opacak; Marco Piccardo; Benedikt Schwarz; Federico Capasso

doi:10.1117/12.3016806

13 March 2024 Bright-dark solitons in a hybridized frequency comb

Theodore P. Letsou, Dmitry Kazakov, Pawan Ratra, Lorenzo L. Columbo, Sandro Dal Cin, Nikola Opacak, Marco Piccardo, Benedikt Schwarz, Federico Capasso

Author Affiliations +

Proceedings Volume PC12905, Novel In-Plane Semiconductor Lasers XXIII; PC1290509 (2024) https://doi.org/10.1117/12.3016806
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Bright pulses of light are unstable states in free-running semiconductor lasers. Stable bright solitons require an optical bistability---as predicted by mean-field theories such as the Complex Ginzburg Landau Equation (CGLE) or the Lugiato-Lefever Equation (LLE). However, this restriction is relaxed when two lasers are coupled to one another. Here, we identify a new state of light in a pair of semiconductor ring lasers with fast gain dynamics. Two racetrack (RT) quantum cascade lasers (QCLs) when coupled along their straight sections spontaneously produce a frequency comb over the hybridized modes of the coupled cavity. Waveform reconstruction measurements reveal the hybridized comb manifests itself as a pair of bright and dark pulses circulating the coupled cavity simultaneously. In addition, split-step integration of a pair of mutually forced CGLEs faithfully reproduces our experimental measurements, providing some insight on the formation of such states.

Conference Presentation

Citation Download Citation

Theodore P. Letsou, Dmitry Kazakov, Pawan Ratra, Lorenzo L. Columbo, Sandro Dal Cin, Nikola Opacak, Marco Piccardo, Benedikt Schwarz, and Federico Capasso "Bright-dark solitons in a hybridized frequency comb", Proc. SPIE PC12905, Novel In-Plane Semiconductor Lasers XXIII, PC1290509 (13 March 2024); https://doi.org/10.1117/12.3016806

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