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5 March 2022 Coherent broadening and tuning of QCL frequency combs via RF-injection
Barbara Schneider, Filippos Kapsalidis, Mathieu Bertrand, Matthew Singleton, Philipp Täschler, Mattias Beck, Jérôme Faist
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Proceedings Volume PC12009, Quantum Sensing and Nano Electronics and Photonics XVIII; PC120090C (2022) https://doi.org/10.1117/12.2611697
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
We present strong radio-frequency current modulation close to their repetition frequency as a means to control the emitted state of quantum cascade laser frequency combs. In particular, more than doubling of the spectral bandwidth compared to free-running can be achieved throughout the dynamical range of the device. By changing the modulation frequency, the spectral bandwidth and center-frequency can be tuned and by fast switching between modulation frequencies we can multiplex spectral regions with negligible overlap from the same device. In the time-domain, we are able to transition from quasi-continuous to long-pulse output by injecting at high power.
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Barbara Schneider, Filippos Kapsalidis, Mathieu Bertrand, Matthew Singleton, Philipp Täschler, Mattias Beck, and Jérôme Faist "Coherent broadening and tuning of QCL frequency combs via RF-injection", Proc. SPIE PC12009, Quantum Sensing and Nano Electronics and Photonics XVIII, PC120090C (5 March 2022); https://doi.org/10.1117/12.2611697
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KEYWORDS
Frequency combs
Quantum cascade lasers
Modulation
Fourier spectroscopy
Fourier transforms
Phase shift keying
Picosecond phenomena
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