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Proceedings Paper

Narrow-stripe broad-area lasers with distributed-feedback surface gratings as brilliant sources for high power spectral beam combining systems
Author(s): J. Decker; P. Crump; J. Fricke; H. Wenzel; A. Maaβdorf; G. Erbert; G. Tränkle
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Paper Abstract

Laser systems based on spectral beam combining (SBC) of broad-area (BA) diode lasers are promising tools for material processing applications. However, the system brightness is limited by the in-plane beam param- eter product, BPP, of the BA lasers, which operate with a BPP of < 3mm-mrad. The EU project BRIDLE ( is developing novel diode laser sources for such systems, and several technological advances are sought. For increased system brightness and optimal ber-coupling the diode lasers should operate with reduced BPP and vertical far eld angle (95% power content), μV 95. The resulting diode lasers are fabricated as mini- bars for reduced assembly costs. Gratings are integrated into the mini-bar, with each laser stripe emitting at a different wavelength. In this way, each emitter can be directed into a single bre via low-cost dielectric filters. Distributed-feedback narrow-stripe broad-area (DFB-NBA) lasers are promising candidates for these SBC sys- tems. We review here the design process and performance achieved, showing that DFB-NBA lasers with stripe width, W = 30 μm, successfully cut of higher-order lateral modes, improving BPP. Uniform, surface-etched, 80th-order Bragg gratings are used, with weak gratings essential for high e ciency. To date, such DFB-NBA sources operate with < 50% effciency at output power, Pout < 6 W, with BPP < 1.8 mm-mrad and offV 95 36 . The emission wavelength is about 970 nm and the spectral width is < 0.7 nm (95% power). The BPP is half that of a DFB-BA lasers with W = 90 um. We conclude with a review of options for further performance improvements.

Paper Details

Date Published: 12 March 2014
PDF: 7 pages
Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 89650I (12 March 2014); doi: 10.1117/12.2031782
Show Author Affiliations
J. Decker, Ferdinand-Braun-Institut (Germany)
P. Crump, Ferdinand-Braun-Institut (Germany)
J. Fricke, Ferdinand-Braun-Institut (Germany)
H. Wenzel, Ferdinand-Braun-Institut (Germany)
A. Maaβdorf, Ferdinand-Braun-Institut (Germany)
G. Erbert, Ferdinand-Braun-Institut (Germany)
G. Tränkle, Ferdinand-Braun-Institut (Germany)

Published in SPIE Proceedings Vol. 8965:
High-Power Diode Laser Technology and Applications XII
Mark S. Zediker, Editor(s)

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