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Proceedings Paper

Micro-optical components for fiber coupling of high-power laser diode bars
Author(s): Torsten Possner; Bernhard Messerschmidt; Anke Kraeplin; Bernd Hoefer; Peter Schreiber
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Paper Abstract

A microoptical beam transformation system for coupling a high power laser diode bars into multimode optical fibers is introduced. The key components are a gradient-index cylindrical lens for the collimation of the fast-axis radiation and an array of blazed gratings for beam deflection of the single emitter bundles in the slow-axis. Excellent optical performance and high numerical aperture is required for the cylindrical lens. The lenses are fabricated by Ag+/Na+ ion exchange and exhibit diffraction-limited performance up to N.A. equals 0.5. The array of blazed gratings is produced by e-beam lithography in a variable dose writing mode. The diffraction efficiency into the desired order is higher than 85% for each element. Using these elements coupling of more than 60% of the output power of a 19 emitter high power laser diode bar (Pout equals 20 W) into a 200 micrometers fiber of N.A. equals 0.2 is achieved. Applications in fiber laser pumping, solid state laser pumping as well as laser soldering and plastic welding are discussed.

Paper Details

Date Published: 17 September 1999
PDF: 8 pages
Proc. SPIE 3778, Gradient Index, Miniature, and Diffractive Optical Systems, (17 September 1999); doi: 10.1117/12.363755
Show Author Affiliations
Torsten Possner, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Bernhard Messerschmidt, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Anke Kraeplin, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Bernd Hoefer, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Peter Schreiber, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)


Published in SPIE Proceedings Vol. 3778:
Gradient Index, Miniature, and Diffractive Optical Systems
Alan D. Kathman, Editor(s)

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