High-power 735 nm GaAsP/AlGaAs laser diodes: reliability and beam characteristics

Author

Sumpf, Bernd ; Hulsewede, R. ; Erbert, Gotz ; Fricke, J. ; Knauer, A. ; Pittroff, Wolfgang ; Ressel, P. ; Sebastian, J. ; Wenzel, Hans ; Trankle, Gunther

Author_Institution

Ferdinand-Braun-Inst. fur Hochsfrequenstech., Berlin, Germany

fYear

2001

fDate

11-11 May 2001

Firstpage

32

Lastpage

33

Abstract

Summary form only given. The increasing interest for light sources in the spectral region between 710 nm and 780 nm is due to special medical applications, for example photodynamic therapy (PDT), which requires high-brightness light sources in this spectral region. The most promising light sources for this purpose are high power diode lasers. In this paper results for high power diode lasers applying tensile-strained GaAsP quantum wells embedded in AlGaAs were presented. These diode lasers having a large optical cavity (LOC) structure show a high wall-plug efficiency larger than 50% and a small vertical divergence of about 25/spl deg/ FWHM. The long-term behavior of broad area lasers is shown and the beam characteristics of broad area lasers and tapered lasers are compared.

Keywords

III-V semiconductors; aluminium compounds; gallium arsenide; laser applications in medicine; laser beams; laser cavity resonators; laser reliability; laser transitions; photodynamic therapy; quantum well lasers; 710 to 780 nm; 735 nm; FWHM; GaAsP-AlGaAs; beam characteristics; broad area lasers; high wall-plug efficiency; high-brightness light sources; high-power 735 nm GaAsP/AlGaAs laser diodes; large optical cavity; long-term behavior; mall vertical divergence; medical applications; photodynamic therapy; reliability; spectral region; tapered lasers; tensile-strained GaAsP quantum wells; Diode lasers; Electrons; Erbium-doped fiber lasers; Laser beam cutting; Laser beams; Laser modes; Laser tuning; Optical waveguides; Pump lasers; Waveguide lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-662-1

Type

conf

DOI

10.1109/CLEO.2001.947426

Filename

947426