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Femtosecond pulses from a mid-infrared quantum cascade laser
(2021)2021 27th International Semiconductor Laser Conference (ISLC)We report on the generation of near-transform-limited femtosecond pulses from a mid-infrared quantum cascade laser by external pulse compression. The temporal nature of these pulses is assessed by means of a novel optical sampling method, coherent beatnote interferometry and interferometric autocorrelation.Other Conference Item -
Coherent Broadening and Tuning of QCL Frequency Combs via RF-Injection
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Quantum cascade laser (QCL) optical frequency combs [1] , [2] are emerging as promising sources in mid-infrared spectroscopy due to their ability to act as coherent broadband sources at room temperature with equidistant phase-locked modes. Their short sub-picosecond upper-state lifetime enables high modulation speeds of the device in the order of tens of gigahertz [3] . Since the devices are electrically driven, the intermode beating, ...Other Conference Item -
Quantum cascade laser femtosecond pulses for supercontinuum generation
(2022)OSA Technical Digest ~ Conference on Lasers and Electro-OpticsIn this work, we demonstrate the generation of 630 fs, 4.5 W pulses from a mid-infrared quantum cascade laser by gain modulation induced spectral broadening and external pulse compression. Such sources open new pathways for broadband supercontinuum generation in the mid-infrared.Other Conference Item -
RF-Injection Controlled Quantum Cascade Lasers
(2022)OSA Technical Digest ~ Conference on Lasers and Electro-OpticsWe demonstrate the manipulation of the quantum cascade laser output state using microwave-injection. In the spectral domain, the optical bandwidth can be doubled, whereas in the time-domain, we observe narrow, approximately 1 ps wide features.Other Conference Item -
RF-Injection Controlled Quantum Cascade Lasers
(2022)Technical Digest Series ~ Optica High-brightness Sources and Light-driven Interactions Congress 2022In this work, we control the quantum cascade laser output state using microwave modulation. We demonstrate doubling of the spectral bandwidth as well as the generation of very narrow, approximately 1 ps wide features.Other Conference Item -
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RF-Injection Controlled of Quantum Cascade Lasers in the Time-Domain
(2022)OSA Technical Digest ~ European Conference on Optical Communication (ECOC) 2022In this work, we demonstrate control over the time-domain state quantum cascade laser output state using microwave modulation. We demonstrate narrow, pulse-like features with a full-with at half-maximum of 558 fs when isolated, which corresponds to the expected Fourier-transform limited pulse-width.Other Conference Item -
Coherent Broadening and Tuning of QCL Frequency Combs via RF-Injection
(2022)Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XVIIIWe 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 ...Other Conference Item