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  4. Real-time spectroscopy enabled by external cavity QCLs with MOEMS diffraction gratings
 
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2017
  • Konferenzbeitrag

Titel

Real-time spectroscopy enabled by external cavity QCLs with MOEMS diffraction gratings

Abstract
In this contribution, we report on real-time mid-IR spectroscopy enabled by rapidly tunable External Cavity Quantum Cascade Lasers (EC-QCLs). High speed spectral scanning in a Littrow-type resonator is realized by employing a resonantly driven micro-opto-electro-mechanical-systems (MOEMS) grating as wavelength selective element. Oscillating at a frequency of 1 kHz with mechanical amplitudes of up to 10°, the MOEMS grating is able to cover the whole spectral range provided even by broad-gain QCL chips in just 500 ms. In addition to the high spectral scanning frequency, the MOEMS approach also allows for a miniaturized and rugged design of the EC-QCL. An evaluation of this laser source with regard to spectral reproducibility of consecutive scans, pulse intensity noise, and spectral resolution will be given. Furthermore, we present spectroscopic measurements in backscattering as well as in transmission geometry, demonstrating the real-time capability in different scenarios.
Author(s)
Butschek, Lorenz
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Hugger, Stefan
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Jarvis, Jan-Philip
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Härtelt, Marko
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Merten, André
Fraunhofer-Institut für Photonische Mikrosysteme IPMS
Grahmann, Jan
Fraunhofer-Institut für Photonische Mikrosysteme IPMS
Boskovic, Dusan
Fraunhofer-Institut für Chemische Technologie ICT
Fuchs, Frank
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Ostendorf, Ralf
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Schilling, Christian
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Rattunde, Marcel
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Wagner, Joachim
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Hauptwerk
Quantum Sensing and Nano Electronics and Photonics XIV
Konferenz
Conference "Quantum Sensing and Nano Electronics and Photonics" 2017
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DOI
10.1117/12.2251915
Language
Englisch
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IAF
IPMS
ICT
Tags
  • quantum cascade laser...

  • MOEMS

  • external cavity laser...

  • mid-IR spectroscopy

  • real-time spectroscop...

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