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400 µm stripe lasers for high-power fiber coupled pump modules

R. Platz1, G. Erbert1, W. Pittroff1, M. Malchus2, K. Vogel1, and G. Tränkle1

Published in:

High Power Laser Sci. Eng., vol. 1, no. 1, pp. 60-67 (2013).

Abstract:

We present a 940 nm quasi-continuous wave semiconductor laser designed as a building block for high-power fiber coupled pump modules. The laser comprises a 400 µm narrow-stripe array mounted on an aluminum nitride substrate using hard solder. The chip has been optimized for high optical power and low lateral far-field angles. Two vertical and six lateral structure variations have been investigated to determine the best achievable performance. Operating at 1 ms pulse width and a repetition rate of 10 Hz, the laser device reaches a maximum pulse power of 86 W from a 400 µm aperture and more than 62% maximum conversion efficiency. Low lateral far-field angles (95% power enclosed) of 11.5° and 13.5°, depending on the epitaxial design, enable efficient multimode fiber coupling. The potential for highly reliable applications has been demonstrated.

1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
2 University of Applied Sciences Munich, Lothstraße 34, 80335 Munich, Germany

Keywords:

diode laser; high-power laser array; optical fiber coupling

© Cambridge University Press 2013. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the Cambridge University Press.

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