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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 -
Broadband THz quantum cascade laser frequency combs with surface emission and inverse-designed facet reflectors
(2023)Other Conference Item -
Direct measurement of an ultrafast sub-bandwidth-limited signal in mid-infrared quantum cascade lasers
(2023)Other Conference Item -
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A Planar Plasmonic Reflector For Polaritons
(2023)2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)The coupling between propagating plasmons in two-dimensional electron gases and deeply subwavelength resonators with submicron gaps can lead to energy leakage and limit the achievable coupling strength. To overcome this physical limit, a “plasmonic reflector” structure is proposed to optically reflect and re-confine this leakage back in the cavity.Other Conference Item -
Coherent walk and lock in driven fast-gain frequency-combs
(2023)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)Locking multiple modes into a frequency comb is key for multiple metrological applications, and a great effort has been therefore invested in this challenge over the last decade. The most common techniques are based on either nonlinearities or modulation of the cavity, while the latter is considered the more controllable method to produce frequency combs. The modulation couples cavity modes and creates a lattice in a synthetic dimension ...Other Conference Item -
Surface-emitting THz quantum cascade laser frequency comb with tunable external mirror dispersion compensation
(2023)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)We present a surface emitting THz quantum cascade laser frequency comb with an adjustable chromatic dispersion compensation via a mechanically tunable GTI cavity. Surface emission and high optical feedback into the laser cavity are achieved by a planarized ridge waveguide design with low reflectivity facets and two broadband patch array antennas for coupling to an external mirror (back side) and for power extraction (front side). We ...Other Conference Item -
Radio-frequency enabled comb in ring Quantum Cascade Laser
(2023)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)Frequency combs (FC) generated by quantum cascade lasers (QCLs) are a promising tool for precision spectroscopy and gas sensing. Recently, ring QCLs have emerged as a new platform for generating FC with unique advantages over Fabry-Perot geometry. While the bandwidth of such Fabry-Perot devices is determined by the device geometry and dispersion, radio-frequency injected devices with circular geometry enable the exploitation of the full ...Other Conference Item -
Asynchronous upconversion sampling of frequency modulated combs
(2023)Technical Digest Series ~ Conference on Lasers and Electro-Optics 2023We demonstrate an asynchronous optical sampling technique for the temporal characterization of frequency modulated combs. On the basis of a mid-infrared quantum cascade laser frequency comb, we measure both its instantaneous intensity and optical frequency.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