We report here on a quartz-enhanced photoacoustic (QEPAS) sensor employing a quantum cascade laser (QCL) structure capable of operating in a pure amplitude or wavelength modulation configuration. The QCL structure is composed of three electrically independent sections: Gain, Phase (PS) and Master Oscillator (MO). Selective current pumping of these three sections allows obtaining laser wavelength tuning without changes in the optical power, and power modulation without emission wavelength shifts. A pure QEPAS amplitude modulation condition is obtained by modulating the PS current, while pure wavelength modulation is achieved by modulating simultaneously the MO and PS QCL sections and slowly scanning the DC current level injected in the PS section.

Purely wavelength- and amplitude-modulated quartz-enhanced photoacoustic spectroscopy / Patimisco, Pietro; Sampaolo, Angelo; Bidaux, Yves; Bismuto, Alfredo; Scott, Marshall; Jiang, James; Muller, Antoine; Faist, Jerome; Tittel, Frank K.; Spagnolo, Vincenzo Luigi. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 24:23(2016), pp. 25943-25954. [10.1364/OE.24.025943]

Purely wavelength- and amplitude-modulated quartz-enhanced photoacoustic spectroscopy

Patimisco, Pietro;Sampaolo, Angelo;SPAGNOLO, Vincenzo Luigi
2016-01-01

Abstract

We report here on a quartz-enhanced photoacoustic (QEPAS) sensor employing a quantum cascade laser (QCL) structure capable of operating in a pure amplitude or wavelength modulation configuration. The QCL structure is composed of three electrically independent sections: Gain, Phase (PS) and Master Oscillator (MO). Selective current pumping of these three sections allows obtaining laser wavelength tuning without changes in the optical power, and power modulation without emission wavelength shifts. A pure QEPAS amplitude modulation condition is obtained by modulating the PS current, while pure wavelength modulation is achieved by modulating simultaneously the MO and PS QCL sections and slowly scanning the DC current level injected in the PS section.
2016
Purely wavelength- and amplitude-modulated quartz-enhanced photoacoustic spectroscopy / Patimisco, Pietro; Sampaolo, Angelo; Bidaux, Yves; Bismuto, Alfredo; Scott, Marshall; Jiang, James; Muller, Antoine; Faist, Jerome; Tittel, Frank K.; Spagnolo, Vincenzo Luigi. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 24:23(2016), pp. 25943-25954. [10.1364/OE.24.025943]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/87171
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