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Proceedings Paper

Optimization of GaAsP-QWs for high-power diode lasers at 800 nm
Author(s): Hans Wenzel; Goetz Erbert; Frank Bugge; Arne Knauer; Juergen Maege; Juergen Sebastian; R. Staske; Klaus Vogel; Guenther Traenkle
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Paper Abstract

Tensile-strained GaAsP quantum wells (QWs) embedded in AlGaAs waveguide and cladding layers are an alternative approach for the wavelength range 700 - 800 nm. We will present a detailed experimental and theoretical study of the dependence of the threshold current on the thickness and the strain of the QW for 800 nm. The optimum thickness of the GaAsP QW for a minimum threshold current density is about 14 nm and is thus much larger than for compressively strained QWs. Higher characteristic temperatures T0 can be obtained with even thicker QWs. In order to achieve high optical output powers and good fiber coupling efficiencies, we used broad waveguides with weak optical confinement and small far field divergence. We prepared two structures with 1 micrometers thick Al0.65Ga0.35As (structure A) and 2 micrometers thick Al0.45Ga0.55As (structure B) waveguides, respectively. For structure B, the thickness of the Al0.70Ga0.30As cladding layers must be carefully optimized in order to suppress higher-order transverse modes. Whereas structure B yields a higher maximum cw output power of AR/HR coated broad-area devices, structure A shows a better high-temperature behavior. Aging tests performed at 2 W (100 micrometers stripe width) and 25 degree(s)C suggest a very good reliability of these devices.

Paper Details

Date Published: 18 April 2000
PDF: 7 pages
Proc. SPIE 3947, In-Plane Semiconductor Lasers IV, (18 April 2000); doi: 10.1117/12.382104
Show Author Affiliations
Hans Wenzel, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Goetz Erbert, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Frank Bugge, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Arne Knauer, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Juergen Maege, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Juergen Sebastian, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
R. Staske, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Klaus Vogel, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)
Guenther Traenkle, Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik (Germany)


Published in SPIE Proceedings Vol. 3947:
In-Plane Semiconductor Lasers IV
Luke J. Mawst; Ramon U. Martinelli, Editor(s)

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