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Frequency Control of a Mid-Infrared Quantum Cascade Laser Frequency Comb by Near-Infrared Light Injection and Intensity Modulation
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Mid-infrared (MIR) quantum cascade laser (QCL) frequency combs are a convenient technology for MIR dual comb spectroscopy. A common method to increase the signal-to-noise ratio in this type of applications is by mutual stabilization of the frequency combs. The mode spacing in a QCL comb can be injection-locked via electrical injection of a radio-frequency close to the repetition rate ( f rep ) [1] . The control of the comb offset 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 -
Ultra-low Threshold Quantum Cascade Laser
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Quantum cascade lasers (QCLs) are widely used in the mid-infrared region for spectroscopic and gas-sensing applications. Due to the high operating voltage and typically Watt-level input power, bulky cooling systems are generally needed for driving a QCL at continuous-wave operation, which limit QCL applications on portable platforms. One approach for reducing the threshold dissipation power of a QCL is the combination of small volume ...Other Conference Item -
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Planarized waveguides for high-performance THz quantum cascade laser frequency
(2022)Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XVIIIWe present a planarized double metal waveguide THz quantum cascade laser, where the top contact metallization extends beyond the active region, above the surrounding low-loss BCB polymer. Placing wire bonds over the BCB-covered area enables the fabrication of extremely narrow waveguide dimensions with reduced power dissipation. Compared to a standard double metal waveguide, improvements in waveguide losses, dispersion, RF and thermal ...Other Conference Item -
Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs
(2022)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2022)We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered waveguide devices feature a strong field-enhancement effect, which results in an improved comb performance. This includes free-running comb states ...Other Conference Item -
Characterization and analysis of a symmetry-breaking THz chiral metamaterial
(2022)QUANTUMatter 2022 Abstract BookOther Conference Item -
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Femtosecond pulses from a mid-infrared quantum cascade laser
(2021)OSA Technical Digest ~ CLEO: Science and Innovations, Proceedings Conference on Lasers and Electro-Optics, Part of CLEO: 2021, 9–14 May 2021, San Jose, California, United StatesOther Conference Item -