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Spectral tuning and mode competition in quantum cascade lasers studied by time-resolved Fourier transform spectroscopy

Untersuchung des Abstimmverhaltens und der Modenkonkurrenz von Quantenkaskadenlasern mittels zeitaufgelöster Fourier Transform Spektroskopie
: Fuchs, F.; Kirn, B.; Mann, C.; Yang, Q.K.; Bronner, W.; Raynor, B.; Köhler, K.; Wagner, J.


Analoui, M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical Methods in the Life Sciences : 1-3 October, 2006, Boston, Massachusetts, USA
Bellingham/Wash.: SPIE, 2006 (SPIE Proceedings Series 6386)
ISBN: 0-8194-6484-8
Paper 63860I
Conference "Optical Methods in the Life Sciences" <2006, Boston/Mass.>
Conference Paper
Fraunhofer IAF ()
spectral tuning; Abstimmverhalten; mode competition; Modenkonkurrenz; quantum cascade laser; Quantenkaskadenlaser; zeitaufgelöste FTIR Spektroskopie; time-resolved FTIR spectroscopy

We present a study of the spectral characteristics of Fabry-Perot quantum cascade lasers in pulsed mode operation applying a time resolution of 3 ns in combination with a high spectral resolution of 0.02 cm-1. With this technique the laser spectra were investigated applying pulse lengths ranging between 100 ns and 20 µs and duty cycles between 0.01% and 10%. Depending on the current density and operation temperature, the spectra exhibit complex line patterns, which indicate mode competition caused by gain saturation effects.