Cascade laser
81 supra-THz beams generated by a Fourier grating and a quantum cascade laser
... 7 y.n.gan@sron.nl 8 j.r.gao@sron.nl Abstract: Large heterodyne receiver arrays (~100 pixel) allow astronomical instrumentations to map more area within limited space mission lifetime. One challenge is to generate ...
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Direct modulation and bandwitdh measurement of terahertz quantum cascade laser
... Keywords: Bandwidth measurement, Quantum Cascade Laser, Modulation, Modelling 1. INTRODUCTION This paper aims at proposing a theoretical description of small signal modulation of Quantum Cascade ...
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3.5 Thz Quantum Cascade Laser at 70 K as Local Oscillator
... Index Terms—terahertz, quantum cascade laser, high temperature, far-field beam, hot electron bolometer I. I NTRODUCTION he hydroxyl (OH) radical has been identified to be a crucial probe for problems ...
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First analysis of strong optical feedback on a packaged Fabry-Perot quantum cascade laser emitting at 4 µm
... quantum cascade laser emitting at 4 µm Laur´eline Durupt 1,* , Olivier Spitz 1,† , and Fr´ed´eric Grillot 1,2 1 LTCI, T´el´ecom Paris, Institut Polytechnique de Paris, 19 place Marguerite Perey, 91120 ...
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Controlling the Likelihood of Extreme Pulses in a Quantum Cascade Laser with Optical Feedback and Bias Perturbation
... Controlling the Likelihood of Extreme Pulses in a Quantum Cascade Laser with Optical Feedback and Bias Perturbation O. Spitz 1,2,3* , J. Wu 3,4 , M. Carras 2 , C. W. Wong 3 and F. Grillot 1,3,5 1 LTCI, ...
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First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser
... Abstract Using a free-running distributed-feedback quantum cascade laser QCL emitting at 9.54 µm, the pressure shift parameters of four intense rovibrational transitions in the ν3 fundam[r] ...
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Active hyperspectral mid-infrared imaging based on a widely tunable quantum cascade laser for early detection of plant water stress
... In Sec. 2 , we introduce our imaging system, based on recent tunable monochromatic light sources as MIR quantum cascade laser (QCL), and the image processing method to extract the reflectance spectra. In ...
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Low-frequency fluctuations of a mid-infrared quantum cascade laser operating at cryogenic temperatures
... the laser destabilization takes place at a lower feedback ratio through an increase of the carrier-to-photon lifetime ratio which is an impor- tant feature for understanding the underlying physics of ...
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Chaotic optical power dropouts driven by low frequency bias forcing in a mid-infrared quantum cascade laser
... (DFB) laser from mirSense with a metal grating cladding at the top of the laser ...the laser cavity, one of the facets of the laser is highly reflective and the other one is cleaved to have a ...
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Frequency noise correlation between the offset frequency and the mode spacing in a mid-infrared quantum cascade laser frequency comb
... The measured transfer functions are displayed in Fig. 4 . They present the same behavior, both in amplitude and in phase, with a flat amplitude response up to ∼10 kHz. This limited bandwidth results from the fact that ...
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Extensive study of the linewidth enhancement factor of a distributed feedback quantum cascade laser at ultra-low temperature
... In laser diodes, experiments with several techniques, such as direct measurement of the subthreshold optical spectrum as the injected current is varied, 13 radio-frequency measurements, 14 ...
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Temperature dependence of a mid-infrared quantum cascade laser with external optical feedback
... The laser light becomes S-polarized in that configuration and the maximum reachable feedback is ...the laser starts for lower values of the feedback ...
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Bipolar cascade laser sources for directly modulated links
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A phonon scattering assisted injection and extraction based terahertz quantum cascade laser
... laser frequency. In order to inject carriers selectively to the ULS and not the LLS, the injection barrier should be chosen meticulously: thick enough to avoid the coun- terproductive (also called “wrong”) ...
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Optical-Feedback Cavity-Enhanced Absorption Spectroscopy with a Quantum Cascade Laser.
... A few recent papers describe applications were a QCL is coupled with a high finesse cavity by CEAS or CRDS [5–7]. This was made possible by the advent of contin- uously tuneable CW QCLs, since pulsed QCLs achieve high ...
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Dynamic modeling of Terahertz Quantum cascade lasers
... E. Kapon, “Electrical modeling of long-wavelength vcsels for intrinsic parameters extraction,” IEEE Journal of Quantum Electronics, vol. 46, March 2010. Yoann Petitjean (S06) was born in Epinal, France, in 1982. He ...
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Steady states in dual-cascade wave turbulence
... states of equation (12) is reduced to the study of equation (13) for different choices of the constant fluxes P and Q. In the present work, we will restrict ourselves to the cases where either P = 0 or Q = 0. Moreover, ...
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Optique non-linéaire résonante dans les lasers à cascade quantique
... 24 Chapitre I. Lasers à Cascade Quantique par heure), coûteuse et très sophistiquée, ce qui la rend moins accessible pour des productions plus massives de LCQ. A la différence de l’épitaxie par jet moléculaire, ...
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La cascade de l'azote dans les territoires de grande culture du Nord de la France
... La cascade de l'azote dans les territoires de grande culture du Nord de la France Résumé Le terme « cascade de l’azote » de´signe l’ensemble des transferts successifs des formes re´actives de cet e´le´ment ...
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Étude de la modulation de la cascade de l'interféron suite à l'infection par le VIH
... Ferbas J, Navratii J, Logar A and Rinaido C (1995) Seiective decrease in human immunodeficiency virus type 1 (HIV-1)-induced alpha interferon production by peripheral biood mononuclear c[r] ...
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