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Proceedings Paper

Quantum-cascade lasers without injector regions
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Paper Abstract

We present the status of quantum-cascade lasers without injector regions, based on a four- and five-level staircase, respectively. First lasers were realized at a wavelength of ~ 10 &mgr;m. By applying an optimized design, we achieved high performance injectorless quantum-cascade lasers emitting at ~ 6.7 &mgr;m. On the basis of this design, we investigated the influence of doping density and the number of periods of active sections. A sample with a doping sheet density of 2.5x1010 cm-2 and 60 periods of active sections shows record low threshold current densities of 0.75 kA/cm2 at 300 K. Recently, we have further extended the wavelength range even down to ~ 4.2 &mgr;m.

Paper Details

Date Published: 26 February 2007
PDF: 13 pages
Proc. SPIE 6485, Novel In-Plane Semiconductor Lasers VI, 648507 (26 February 2007); doi: 10.1117/12.697562
Show Author Affiliations
A. Friedrich, Technical Univ. of Munich (Germany)
M.-C. Amann, Technical Univ. of Munich (Germany)

Published in SPIE Proceedings Vol. 6485:
Novel In-Plane Semiconductor Lasers VI
Carmen Mermelstein; David P. Bour, Editor(s)

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