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Proceedings Paper

Real-time spectroscopic sensing using a widely tunable external cavity-QCL with MOEMS diffraction grating
Author(s): Ralf Ostendorf; Lorenz Butschek; André Merten; Jan Grahmann; Jan Jarvis; Stefan Hugger; Frank Fuchs; Joachim Wagner
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Paper Abstract

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.

Paper Details

Date Published: 13 February 2016
PDF: 8 pages
Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 975507 (13 February 2016); doi: 10.1117/12.2209064
Show Author Affiliations
Ralf Ostendorf, Fraunhofer Institute for Applied Solid State Physics IAF (Germany)
Lorenz Butschek, Fraunhofer Institute for Applied Solid State Physics IAF (Germany)
André Merten, Fraunhofer Institute for Photonic Microsystems IPMS (Germany)
Jan Grahmann, Fraunhofer Institute for Photonic Microsystems IPMS (Germany)
Jan Jarvis, Fraunhofer Institute for Applied Solid State Physics IAF (Germany)
Stefan Hugger, Fraunhofer Institute for Applied Solid State Physics IAF (Germany)
Frank Fuchs, Fraunhofer Institute for Applied Solid State Physics IAF (Germany)
Joachim Wagner, Fraunhofer Institute for Applied Solid State Physics IAF (Germany)


Published in SPIE Proceedings Vol. 9755:
Quantum Sensing and Nano Electronics and Photonics XIII
Manijeh Razeghi, Editor(s)

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