Mid infrared quantum cascade laser operating in pure amplitude modulation for background-free trace gas spectroscopy

作者：Bidaux Yves^*; Bismuto Alfredo; Patimisco Pietro; Sampaolo Angelo; Gresch Tobias; Strubi Gregory; Blaser Stephane; Tittel Frank K; Spagnolo Vincenzo; Muller Antoine; Faist Jerome

来源：Optics Express, 2016, 24(23): 26464-26471.

DOI：10.1364/OE.24.026464

We present a single mode multi-section quantum cascade laser source composed of three different sections: master oscillator, gain and phase section. Non-uniform pumping of the QCL's gain reveals that the various laser sections are strongly coupled. Simulations of the electronic and optical properties of the laser (based on the density matrix and scattering matrix formalisms, respectively) were performed and a good agreement with measurements is obtained. In particular, a pure modulation of the laser output power can be achieved. This capability of the device is applied in tunable-laser spectroscopy of N2O where background-free quartz enhanced photo acoustic spectral scans with nearly perfect Voigt line shapes for the selected absorption line are obtained.

• 出版日期2016-11-14