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Rotational Fourier-Transform Mid-IR spectroscopy with a Quantum Cas- cade Laser frequency comb
(2023)2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Real-time spectroscopy with simultaneous high speed, high spectral resolution, and broad bandwidth is of vital importance for studying non-repetitive reactions and process monitoring [1]. The general purpose instrument for infrared spectroscopy has been Fourier-Transform infrared (FTIR) spectroscopy, due to its flexibility brought by extremely broad-band globar sources. While state-of-the-art rapid-scan FTIR can reach time resolutions of ...Other Conference Item -
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 -
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 -
Asynchronous Upconversion Sampling of Frequency Modulated Combs
(2023)Laser & Photonics Reviews ~ 17In recent years, optical frequency combs with a frequency modulated output have attracted considerable attention. While first observed decades ago in externally modulated lasers, a whole class of semiconductor lasers has since been identified to spontaneously enter such a regime of self frequency modulation. The temporal properties of these sources are commonly measured indirectly via phase-resolved frequency domain measurements. In this ...Journal Article -
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 -
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 -
Quantum Cascade Surface Emitting Lasers
(2024)Laser & Photonics ReviewsA low-cost single frequency laser, emitting in the mid-infrared spectral region and dissipating minimal electrical power, is a key ingredient for the next generation of portable gas sensors for high-volume applications involving chemical sensing of important greenhouse and pollutant gases. Herein, a Quantum Cascade Surface Emitting Laser (QCSEL) is proposed, which is implemented as a short linear cavity with high reflectivity coated ...Journal Article -
Measurement of sub-Poissonian shot noise in a quantum cascade detector
(2024)Applied Physics LettersIn a Quantum Cascade Detector, photocurrent is generated by the absorption of infrared and terahertz radiation in the quantum-well-based modules arranged in series. Consequently, the current responsivity is by construction inversely proportional to the number of cascading modules. Upon absorption of a photon, the electron travels through only a single period of the detector, with a mean free path corresponding to the period length. ...Journal Article -
Femtosecond pulses from a mid-infrared quantum cascade laser
(2021)Nature PhotonicsThe quantum cascade laser has evolved to be a compact, powerful source of coherent mid-infrared light; however, its fast gain dynamics strongly restricts the formation of ultrashort pulses. As such, the shortest pulses reported so far were limited to a few picoseconds with some hundreds of milliwatts of peak power, strongly narrowing their applicability for time-resolved and nonlinear experiments. Here we demonstrate an approach capable ...Journal Article