Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 3: Halbleiterlaser I
HL 3.12: Vortrag
Montag, 24. März 2003, 13:15–13:30, BEY/81
Tunable single and dual mode operation of an external cavity quantum dot injection laser — •A. Biebersdorf1, C. Lingk1, M. De Giorgi2, M. Arzberger3, C. Ulbrich3, G. Böhm3, M.-C. Amann3, G. Abstreiter3, and J. Feldmann1 — 1Photonics and Optoelectronics Group, University of Munich, Amalienstrasse 54, 80799 Munich, Germany — 2Istituto Nazionale Fisisca della Materia, Universitá di Lecce, 73100 Lecce, Italy — 3Walter Schottky Institut, Technical University of Munich, Am Coulombwall, 85748 Garching, Germany
We investigate the emission properties of a quantum dot injection laser coupled to an external cavity. The laser consists of 7 layers of InAs/GaAs quantum dots and bears an anti-reflection coating on one facet. Using a Littrow arrangement for the external cavity, the quantum dot laser can be continuously tuned in single mode operation between 1047 nm and 1130 nm over a range of 83 nm. This is accomplished by a spectrally broad gain, which is caused by the size distribution of the quantum dots.
Further, the cross relaxation between spectrally and spatially adjacent quantum dots can be investigated using a Littman arrangement. Here, simultaneous operation on two and three modes with a continuously adjustable mode spacing between 1.1 nm and 34 nm is demonstrated. Simultaneous operation of the two modes is proven by sum frequency generation in a nonlinear crystal.