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Comb formation in ring Quantum Cascade Lasers under radio-frequency injection
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)On-chip frequency combs have drawn increasing attention due to their wide possible range of applications in spectroscopy and the intriguing mechanisms that govern their formation [1]. In the molecular fingerprint region of the mid-infrared, Quantum Cascade Lasers (QCLs) provide a flexible platform for developing such combs with high output powers, small device footprints and extensive spectral coverage [2]. However, in the established ...Other Conference Item -
Surface-Emitting Broadband THz Quantum Cascade Laser Frequency Combs with Inverse-Designed Waveguide Facets
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)THz Quantum Cascade Lasers are unipolar electrically driven semiconductor lasers that can also operate as frequency combs for broadband metrology and sensing [1], [2]. THz quantum cascade lasers are usually processed in double metal waveguide ridges exhibiting low slope efficiencies and a patterned far field [3]. Surrounding the ridge structure with the low-loss polymer Benzocyclobuten (BCB) allows for an extended top contact improving ...Other Conference Item -
Picosecond pulses from a gain-switched quantum cascade laser
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The ultrafast gain recovery dynamics [1] observed in quantum cascade lasers (QCLs) fundamentally restricts the formation of intracavity pulses. On the other hand, this picosecond gain response makes the QCL uniquely suited for microwave modulation of its pump current. Here, we leverage on this property and generate short optical pulses (~ 30 ps) with up to Watt level peak power. Lasing on a single longitudinal mode is achieved via optical ...Other Conference Item -
Sub-Bandwidth Limited Time-Domain Signal in Mid-Infrared Quantum Cascade Lasers
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Quantum cascade lasers (QCLs) offer an attractive platform for mid-infrared frequency combs, due to their compact, on chip geometry, emitting powers as high as 1 W at room-temperature [1–3]. A defining feature is their quasi-continuous intensity output, which is predominantly frequency modulated. To force the QCL into amplitude-modulated operation, active modelocking has been used to achieve pulses on the picosecond-scale [4] and external ...Other Conference Item -
Mid-Infrared Photonic Integrated Platform Based on Fe-Doped InGaAs Buried in InP
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The mid-infrared (mid-IR) spectral range is typically defined from 3 to 20 µm wavelength and has become an important regime for a plethora of industrial or medical purposes, due to the presence of strong absorption lines of many important molecules. This spectral range has been extensively studied during the last two decades, particularly driven by the progress in quantum cascade lasers (QCLs). As next step, the photonic integration of ...Other Conference Item -
Low dissipation quantum cascade surface emitting lasers
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The mid-infrared (MIR) spectral region (2-20 μm) is the molecular “fingerprint” region for many important organic and inorganic molecules [1], [2]. Miniaturized optical gas sensors based on MIR absorption spectroscopy are highly attractive for many applications such as industrial process control, environmental monitoring and medical diagnosis [3]. To enable low-cost and portable MIR gas sensors, compact and low power consuming single-mode ...Other Conference Item -
Two frequency-modulated comb regimes in quantum cascade laser rings
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The unique nature of the gain mechanisms in quantum cascade lasers (QCL) facilitates frequency comb generation without external nonlinear cavities, enabling simple on-chip spectroscopy devices in the mid-IR and THz frequencies [1]. QCLs are extremely important in the molecular fingerprint region of the mid-infrared, where they allow a flexible platform for developing frequency-combs with small device footprints with sufficient output power ...Other Conference Item -
Topological insulator quantum cascade laser in synthetic space: towards a realization
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)When optical nonlinearities are introduced to photonic topological insulators, the system starts separating from its original solid-state roots, and creating fertile ground to completely new inventions, one of which is the topological insulator laser [1]. This type of laser provides single mode lasing of semiconductor laser arrays through robust injection locking from one laser to the next despite inevitable variations and defects in ...Other Conference Item -
Ultrastrong Light Matter Interaction at the Single Element Level
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)The characterization of light-matter interactions at a single-element level is interesting in terms of uncovering theoretically predicted new states of matter and phase transitions.[1] When pushed even further down to a single electron limit, the gained insights could furthermore find applications in quantum information processing.Other Conference Item -
Broadband THz quantum cascade laser frequency combs with surface emission and inverse-designed facet reflectors
(2023)Other Conference Item