Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: Lasers and LEDs II
HL 26.5: Talk
Monday, March 11, 2013, 17:45–18:00, H16
Interband Cascade Lasers for Tunable Laser Spectroscopy — •Michael von Edlinger1, Julian Scheuermann1, Lars Nähle1, Robert Weih2, Adam Bauer2, Marc Fischer1, Sven Höfling2, Johannes Koeth1, and Martin Kamp2 — 1nanoplus GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany — 2Technische Physik University of Würzburg, Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, 97074 Würzburg, Germany
Tunable laser sources have proven themselves as a very successful tool for high performance gas sensing and are used in a variety of challenging applications. Especially the mid infrared (MIR) region between 3 and 4 microns is technologically and industrially relevant, since many gas species have their strongest absorption features in this range, including e. g. important hydrocarbons like methane or acetylene as well as formaldehyde.
In this contribution, a promising approach to MIR distributed feedback (DFB) laser devices based on interband cascade laser material is presented. Continuous wave laser operation above room temperature has already been demonstrated in the wavelength range from 3 to 6 microns based on this concept. A crucial requirement for tunable laser spectroscopy (TLS) is the availability of spectrally monomode emitters such as DFB lasers. In this work distributed feedback is achieved by etched sidewall gratings defined by electron-beam lithography. With this method devices with SMSR around 30 dB have been fabricated in the 3.5 micron wavelength range, well suited for formaldehyde detection.