Speaker
Barbara Schneider
(ETH Zurich)
Description
We present control over the emitted state of quantum cascade laser frequency combs through strong radio-frequency modulation close to their repetition frequency. In particular, coherent broadening of the spectrum from about 20 cm$^{-1}$ to 60cm$^{-1}$ can be achieved throughout the DC-current dynamical range. Close to the free-running beatnote frequency, tuning of the modulation frequency results in tuning of the spectral bandwidth and center-frequency. By switching between modulation frequencies we can multiplex spectral regions with negligible overlap from the same device at rates of at least 20 kHz. In the time-domain, we are able to transition from quasi-continuous to pulsed ($\tau_p \approx 55$ ps) output by injecting at high power.
Primary author
Barbara Schneider
(ETH Zurich)
Co-authors
Filippos Kapsalidis
(ETH Zürich)
Dr
Mathieu Bertrand
(ETH Zurich)
Philipp Täschler
(ETH Zurich)
Johannes Hillbrand
(ETH Zurich)
Matthew Singleton
(ETH Zurich)
Dr
Mattias Beck
(ETH Zurich)
Prof.
Faist Jérôme
(ETH Zurich)
