Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Semiconductor laser I: VECSEL and cascade lasers

HL 70.2: Vortrag

Mittwoch, 2. April 2014, 15:15–15:30, POT 112

Monomode Interband Cascade Lasers in the MIR wavelength range — •Julian Scheuermann1, Michael von Edlinger1, Robert Weih2, Lars Nähle1, Christian Zimmermann1, Marc Fischer1, Johannes Koeth1, Sven Höfling2, and Martin Kamp21nanoplus GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany — 2Technische Physik University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Am Hubland, 97074 Würzburg, Germany

Interband cascade lasers (ICLs) have evolved into important laser sources in the mid infrared (MIR) spectral range. Compared to quantum cascade lasers, they offer significant advantages with respect to threshold power density as well as overall power consumption. In contrast to conventional diode lasers, they are able to cover the entire wavelength region from 3 to 6 microns. This is extremely interesting for high accuracy gas sensing, since many gas species have their strongest absorption features in this range, including e.g. CH4, formaldehyde or NO. Novel monomode ICLs in the MIR wavelength range suited for applications in tunable laser absorption spectroscopy are presented in this talk. The focus is on the design and processing of distributed feedback ICLs and their temperature dependent characteristics. Vertical sidewall gratings defined by electron beam lithography and an optimized dry etch process are the key components to achieve application-grade device performance and monomode emission with high side mode suppression ratio. Continuous wave operation at temperatures up to 80°C with threshold currents below 80 mA was observed.

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