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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 -
Octave-spanning THz quantum cascade laser
(2015)Proceedings of SPIE ~ Quantum Sensing and Nanophotonic Devices XIIWe present a THZ quantum cascade laser operating in continuous wave with an emission covering more than one octave in frequency, and displaying homogeneous power distribution among the lasing modes. The gain medium is based on a heterogeneous quantum cascade structure operating in the THz range. Laser emission takes place from 1.64 THz to 3.35 THz with optical powers of 3 mW and 84 modes above threshold. For narrow waveguides a collapse ...Conference Paper -
Hydride vapour phase epitaxy assisted buried heterostructure quantum cascade lasers for sensing applications
(2015)Proceedings of SPIE ~ Quantum Sensing and Nanophotonic Devices XIIBuried heterostructure (BH) lasers are routinely fabricated for telecom applications. Development of quantum cascade lasers (QCL) for sensing applications has largely benefited from the technological achievements established for telecom lasers. However, new demands are to be met with when fabricating BH-QCLs. For example, hetero-cascade and multistack QCLs, with several different active regions stacked on top of each other, are used to ...Conference Paper -
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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 -
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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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 -