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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 -
THz QCL combs under strong RF injection: temporal dynamics and harmonic states
(2022)Proceedings of SPIE ~ Novel In-Plane Semiconductor Lasers XXIIn this work present high performance QCL-based THz combs operating on fundamental and harmonic comb states operating up to 110 K in the spectral region from 2 to 4 THz . We employ double-metal, Copper- based laser resonators planarized with a polymer allowing high performance with CW operation up to 118 K . Such waveguide layout allows as well optimized RF coupling facilitating injection of high RF power. We analyze the laser emission ...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 -
Frequency comb operation of antenna coupled terahertz quantum cascade ring lasers
(2023)Proceedings of SPIE ~ Quantum Sensing and Nano Electronics and Photonics XIXOther Conference Item -
THz optical solitons in planarized quantum cascade double ring lasers
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Quantum Cascade Lasers (QCL) based on cicular cavities are rapidly progressing as possible sources pf optical solitons [1], [2]. We report soliton formation in dispersion compensated THz ring QCLs [1]. The laser cavity consists of two concentric double metal ring waveguides, designed to support a symmetric and anti-symmetric super-mode where the global GVD is respectively enhanced or decreased [3](Fig. 1 a-b). The two super-modes feature ...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 -
THz optical solitons in planarized quantum cascade double ring lasers
(2023)Technical Digest Series ~ Conference on Lasers and Electro-Optics 2023We report THz optical soliton formation in defect-less ring QCL featuring anomalous dispersion. Free-running spectra with sech2 envelopes are presented together with SWIFT measurement showing ∼12 ps pulses in the reconstructed emission time-profile.Other Conference Item