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THz Quantum Cascade Laser Frequency Comb based on a Y-coupled Planarized Waveguide
(2021)2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Terahertz (THz) quantum cascade lasers (QCLs) can operate as frequency combs [1] and dual combs [2] , making them very appealing for spectroscopy and metrology applications. Recently, Y-split THz QCLs were investigated in the context of tunable single mode operation [3] . Here, we present a Y-coupled double metal planarized waveguide geometry to study broadband phase locking and frequency comb formation.Other Conference Item -
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 -
THz Quantum Cascade Laser Frequency Combs based on Planarized Waveguides
(2022)OSA Technical Digest ~ Conference on Lasers and Electro-OpticsWe present a planarized double metal waveguide platform for THz quantum cascade laser frequency combs with a wide top metallization, extending above the surrounding low-loss BCB polymer. Compared to a standard double metal waveguide, improvements in waveguide losses, RF and thermal properties are observed. Tapered waveguide devices display a field-enhancing effect, improving comb performance due to the enhanced four wave mixing process. ...Other Conference Item -
Planarized tapered waveguides for THz quantum cascade laser frequency combs
(2022)Proceedings of SPIE ~ Terahertz Photonics IITerahertz (THz) quantum cascade lasers (QCLs) based on double metal waveguides are compact sources of broadband THz radiation, which can also operate as frequency combs. We present a planarized double metal waveguide THz QCL platform, where the active region is embedded in a low-loss BCB polymer and covered by an extended top metallization. The latter enables placing bonding wires on the sides above the BCB-covered area, hindering the ...Other Conference Item -
Frequency Comb Operation of a Y-Coupled Planarized THz Quantum Cascade Laser
(2021)2021 27th International Semiconductor Laser Conference (ISLC)We present a Y-coupled planarized double metal waveguide THz quantum cascade laser, featuring frequency comb operation and broadband phase locking of the two arms, as confirmed by characteristic interference patterns measured in the far-field.Other Conference Item -
Broadband active and passive photonics with planarized THz quantum cascade lasers
(2022)Other Conference Item -
Planarized tapered waveguides for high-temperature THz quantum cascade laser frequency combs
(2022)2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)We present a novel planarized double metal waveguide platform for high-performance THz quantum cascade laser frequency combs. The waveguides are embedded in a low-loss polymer (BCB) and have an extended top metallization, resulting in lower waveguide losses and improved RF and thermal properties. A further performance improvement is observed for waveguides with a tapered profile due to nonlinearity-enhancing effects. These free-running ...Other Conference Item -
High-performance Frequency Combs with Planarized THz Quantum Cascade Lasers
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Terahertz (THz) quantum cascade lasers (QCLs) are compact sources of coherent THz radiation which can also operate as frequency combs [1], making them appealing for spectroscopy and sensing. We recently developed a new planarized THz QCL platform, where the active region waveguides are surrounded by a low-loss polymer (BCB). This enables fabricating an extended top metallization and placing bonding wires over the passive area on the sides ...Other Conference Item