Open AccessPure amplitude and wavelength modulation spectroscopy for detection of N2O using a three-section quantum cascade laser
Author(s) -
Pietro Patimisco,
Angelo Sampaolo,
Yves Bidaux,
A. Bismuto,
Marshall Scott,
James Jiang,
Frank K. Tittel,
Vincenzo Spagnolo
Publication year - 2017
Publication title -
proceedings of spie, the international society for optical engineering/proceedings of spie
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.192
H-Index - 176
eISSN - 1996-756X
pISSN - 0277-786X
DOI - 10.1117/12.2252352
Subject(s) - quantum cascade laser , laser , amplitude modulation , wavelength , optics , materials science , optoelectronics , photoacoustic spectroscopy , amplitude , modulation (music) , cascade , phase modulation , semiconductor laser theory , spectroscopy , frequency modulation , physics , chemistry , phase noise , radio frequency , telecommunications , chromatography , quantum mechanics , computer science , acoustics
We report on a novel quantum cascade laser (QCL) capable of operating in pure amplitude or wavelength modulation configuration thereby allowing the acquisition of background-free gas absorption-line profiles using quartz-enhanced photoacoustic spectroscopy (QEPAS). The QCL is composed of three electrically independent sections: Gain, Phase (PS) and Master Oscillator (MO). The non-uniform pumping of these three QCL sections allows laser wavelength tuning with constant optical power and vice-versa. Pure QEPAS amplitude modulation operating conditions were obtained by modulating the PS current, while pure wavelength modulation was obtained by modulating the MO section and slowly scanning the PS current
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