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Proceedings Paper

Methods for improving the beam quality of high-power diode lasers
Author(s): Volker Raab; Martin Ostermeyer; Ralf Menzel
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Paper Abstract

Current commercially available diode lasers with output powers above a few watts lack beam quality, i.e. they have only limited possibility of small foci in combination with long Rayleigh lengths. Recent advances in coherent coupling of such lasers open view to a new generation of high power, high beam quality, low cost lasers suitable for a wide range of technical applications such as microshaping or cutting. Therefore, we performed experiments to couple the 25 diode lasers of a bar with specially coated low-reflection front facets. Mutual coherence can be improved in external resonators as opposed to the internal resonator absent in our case. Additional elements like mode stops can improve beam quality. Here we present results on the coupling of gain- guided broad-area diode lasers in external resonators, both of single emitters and bars of 25 emitters. In the single emitter case we achieved output powers up to 0.8 W at a beam quality of M2 equals 16 or 0.4 W with M2 equals 3.5 along slow axis. For the bars we achieved 10 W with M2 equals 304.

Paper Details

Date Published: 3 April 2000
PDF: 4 pages
Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); doi: 10.1117/12.380875
Show Author Affiliations
Volker Raab, Univ. Potsdam (Germany)
Martin Ostermeyer, Univ. Potsdam (Germany)
Ralf Menzel, Univ. Potsdam (Germany)

Published in SPIE Proceedings Vol. 3889:
Advanced High-Power Lasers
Marek Osinski; Howard T. Powell; Koichi Toyoda, Editor(s)

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