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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 -
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 -
Direct measurement of the linewidth enhancement factor of distributed feedback mid-IR QCLs
(2021)2021 27th International Semiconductor Laser Conference (ISLC)The measurement of the linewidth enhancement factor of mid-IR DFB-QCL assisted by shifted-waves interference Fourier Transform spectroscopy together with its modeling give us insight of the mechanisms responsible on the broadening of the emission and the comb formation process.Other Conference Item -
High-Resolution Rotational Fourier-Transform Infrared Spectroscopy
(2022)2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)We demonstrate a rotational optical delay line for Fourier transform infrared (FTIR) spectroscopy with simultaneous high time and frequency resolutions. Thanks to the rotational motion, the trade-off between speed and spectral resolution present in rapid-scan FTIRs is alleviated, and enables the use of high-brightness quantum cascade laser frequency combs as light sources. We demonstrate the capabilities of the delay line by resolving ...Other Conference Item -
Rotational Fourier-Transform Mid-IR spectroscopy with a Quantum Cas- cade Laser frequency comb
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Real-time spectroscopy with simultaneous high speed, high spectral resolution, and broad bandwidth is of vital importance for studying non-repetitive reactions and process monitoring [1]. The general purpose instrument for infrared spectroscopy has been Fourier-Transform infrared (FTIR) spectroscopy, due to its flexibility brought by extremely broad-band globar sources. While state-of-the-art rapid-scan FTIR can reach time resolutions of ...Other Conference Item