Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Semiconductor Lasers II
HL 18.2: Talk
Monday, March 20, 2017, 15:00–15:15, POT 06
First order coherence of semiconductor nanowire lasers — •Franz Langrieger, Michael Kaniber, Thomas Stettner, Philipp Zimmermann, Gregor Koblmüller, and Jonathan J. Finley — Walter Schottky Institut and Physik Department, Technische Universität München, Garching b. München, Germany
We experimentally probe the temporal coherence of the emission from individual GaAs-AlGaAs core-shell nanowire lasers dispersed onto Al2O3 substrates. Excitation power dependent photoluminescence spectroscopy shows continuous wave lasing from individual nanowires with threshold power densities of 11.3 ± 0.8 kW/cm2 and lasing persists from cryogenic temperatures up to T=140K. By measuring the first order coherence using a Michelson interferometer we obtain coherence times τc of a few ps. Our results are compared with spectral linewidth measurements of the lasing mode. The mechanism that lead to a limitation of the coherence times in nanowire lasers will be discussed.