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20 June 2024 Quantum cascade lasers in circular cavities: from solitons to quantum walk combs
Giacomo Scalari, Paolo Micheletti, Alexander Dikopoltsev, Mathieu Betrand, Urban Senica, Mattias Beck, Jerome Faist, Ina Heckelmann
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Proceedings Volume PC13002, Semiconductor Lasers and Laser Dynamics XI; PC130020C (2024) https://doi.org/10.1117/12.3023866
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Recently , quantum cascade laser proved to be an extremely interesting platform for frequency combs both in Mid-IR and THz frequency ranges. We will discuss some peculiar aspects of these devices arising from the combination of ultrafast gain, circular cavities and strong RF modulation. Despite the ultrafast nature of the gain medium, by properly engineering dispersion we demonstrate dissipative Kerr solitons both in Mid-IR and THz , with pulse durations of 3.7 ps in the Mid-IR and 10 ps in the THz. Then, by RF modulating a circular cavity, we demonstrate a quantum walk comb in synthetic frequency space. The initially ballistic quantum walk does not dissipate into low supermode states of the synthetic lattice; instead, the state stabilizes in a broad frequency comb, unlocking the full potential of the synthetic frequency lattice. Combs as broad as 100 cm-1 in the Mid-IR with flat top profile are reported.
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Giacomo Scalari, Paolo Micheletti, Alexander Dikopoltsev, Mathieu Betrand, Urban Senica, Mattias Beck, Jerome Faist, and Ina Heckelmann "Quantum cascade lasers in circular cavities: from solitons to quantum walk combs", Proc. SPIE PC13002, Semiconductor Lasers and Laser Dynamics XI, PC130020C (20 June 2024); https://doi.org/10.1117/12.3023866
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KEYWORDS
Quantum walks
Quantum cascade lasers
Solitons
Mid infrared
Quantum frequencies
Terahertz radiation
Ultrafast phenomena
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