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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 -
Linewidth Enhancement Factor of Mid-IR Quantum Cascade Lasers
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Schawlow and Townes theorized that the ratio between the spontaneous emission and stimulated emission in a semiconductor laser defines its linewidth lower limit [1] . However, experiments showed that this intrinsic linewidth is larger, which was later demonstrated to be due to the coupling between the optical gain and the phase noise [2] . The linewidth enhancement factor (LEF) was introduced to quantify this process and as a correction ...Other Conference Item -
Coherent mid-infrared dual-comb spectroscopy enabled by optical injection locking of quantum cascade laser frequency combs
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Mid-infrared frequency combs are emerging as powerful tool for broadband spectroscopy in the molecular fingerprint region. Dual-comb spectroscopy is particularly promising due to its high temporal and spectral resolution. In many practical applications, quantum cascade laser (QCL) frequency combs [1] are the source of choice, because they are electrically pumped, have a small footprint and offer an unrivalled brightness. Albeit being a ...Other Conference Item -
Spectra Characterization of Ring Quantum Cascade lasers
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The quantum cascade laser (QCL) based ring structures are becoming hot research areas for laser beam control [1] and mode-locking applications [2] . Recently, with the strong nonlinearity of active region, mid-infrared frequency comb based on ring QCLs have been demonstrated [3] , [4] , showing great potential of pulse generation without using active mode-locking scheme. In this work, we report the development of mid-infrared frequency ...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 -
Linewidth enhancement factor in quantum cascade lasers: measurements and modelling
(2022)Proceedings of SPIE ~ Solid State Lasers XXXI: Technology and DevicesConference Poster -
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Mid-infrared quantum cascade laser frequency combs with a co-planar waveguide geometry
(2020)Conference Poster -
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