Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts

HL 108.19: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Continuous-wave operation of a buried-heterostructure quantum cascade laser — •Mikaela Elagin, Yuri V Flores, Sergii Kurlov, Anna Aleksandrova, Grygorii Monastyrskyi, Jan F Kischkat, Mykhaylo P Semtsiv, and W Ted Masselink — Humboldt University Berlin, Institute of Physics, Newtonstr.15, 12489 Berlin, Germany

We report the continuous wave (cw)-operation of a buried-heterostructure (BH) strain-compensated quantum cascade laser (QCL) using gas-source molecular beam epitaxy both for the growth of the active region as well as for the InP:Fe regrowth of the laser ridge sidewalls. Starting the InP:Fe regrowth directly on the sides of the laser ridge leads to a number of void defects which have a significant impact on heat extraction capabilities of devices. These defects are mostly located at the arsenide-phosphide interface between the active region and the regrown insulating material. Using a 20 nm-thin InAlAs layer between the laser ridge sidewalls and the InP:Fe insulating layers we improve the crystal quality of the interface while preserving the high electrical-resistivity of the overgrownmaterial. This optimized regrowth sequence has led to cw-operation in the 100-210 K temperature range of a 7 μm-wide BH-QCL with an emission wavelength of 5.4 μm. The measured thermal conductance in this temperature range is Gth = 1400-500 W/Kcm2, which is comparable with the state of the art BH-QCLs regrown using metal-organic vapor-phase epitaxy (MOVPE).