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Proceedings Paper

Recent advances of external cavity QCLs with MOEMS diffraction gratings (Conference Presentation)
Author(s): Ralf Ostendorf; Stefan Hugger; Lorenz Butschek; Jan-Philip Jarvis; Marko Härtelt; André Dreyhaupt; Jan Grahmann; Marcel Rattunde; Joachim Wagner
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Paper Abstract

The combination of spectral broadly tunable quantum cascade laser chips in an external cavity (EC-QCL) with a rapid scanning MOEMS grating as wavelength selective element has attracted a lot of attention in recent years. Spectral tuning ranges of more than 350 cm-1 in the mid-infrared fingerprint region combined with scan frequencies of up to 1 kHz for a complete wavelength scan have enabled several new sensing applications such as contactless real time identification of chemical substances via backscattering spectroscopy. Moreover, the technological approach of a MOEMS EC-QCL allows for a dense integration of the electro optical components resulting in a footprint size for the laser source comparable to that of a matchbox. This makes the MOEMS EC-QCL especially attractive for handheld sensing systems. In this talk we present the recent advances on the MOEMS EC-QCL technology made at Fraunhofer IAF and IPMS within the European projects MIRPHAB, Aquarius and Chequers. A detailed analysis of spectral reproducibility of consecutive scans, amplitude noise, and spectral resolution in pulsed and cw operation of the laser source is shown and several showcase applications from online process control in chemical and pharmaceutical industry such as transmission measurements on liquids and gases are discussed.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105401K (14 March 2018); doi: 10.1117/12.2288214
Show Author Affiliations
Ralf Ostendorf, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Stefan Hugger, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Lorenz Butschek, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Jan-Philip Jarvis, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Marko Härtelt, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
André Dreyhaupt, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Jan Grahmann, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Marcel Rattunde, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Joachim Wagner, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)

Published in SPIE Proceedings Vol. 10540:
Quantum Sensing and Nano Electronics and Photonics XV
Manijeh Razeghi; Gail J. Brown; Jay S. Lewis; Giuseppe Leo, Editor(s)

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