13 February 2016 Real-time spectroscopic sensing using a widely tunable external cavity-QCL with MOEMS diffraction grating
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We present spectroscopic measurements performed with an EC-QCL combining a broadly tunable quantum cascade laser chip with a tuning range of more than 300 cm-1 and a resonantly driven MOEMS scanner with an integrated diffraction grating for wavelength selection in Littrow configuration. The grating geometry was optimized to provide high diffraction efficiency over the wide tuning range of the QCL, thus assuring high power density and high spectral resolution in the MIR range. The MOEMS scanner has a resonance frequency of 1 kHz, hence allowing for two full wavelength scans, one up and the other downwards, within 1 ms. The capability for real-time spectroscopic sensing based on MOEMS EC-QCLs is demonstrated by transmission measurements performed on polystyrene reference absorber sheets as well as on gaseous samples of carbon monoxide. For the latter one, a large portion of the characteristic CO absorption band containing several absorption lines in the range of 2070 cm-1 to 2280 cm-1 can be monitored in real-time.
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Ralf Ostendorf, Ralf Ostendorf, Lorenz Butschek, Lorenz Butschek, André Merten, André Merten, Jan Grahmann, Jan Grahmann, Jan Jarvis, Jan Jarvis, Stefan Hugger, Stefan Hugger, Frank Fuchs, Frank Fuchs, Joachim Wagner, Joachim Wagner, } "Real-time spectroscopic sensing using a widely tunable external cavity-QCL with MOEMS diffraction grating", Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 975507 (13 February 2016); doi: 10.1117/12.2209064; https://doi.org/10.1117/12.2209064

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