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Proceedings Paper

High-brightness fiber-coupling schemes for diode laser bars
Author(s): Peter Schreiber; Bernd Hoefer; Peter Dannberg; Uwe D. Zeitner
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Paper Abstract

Fiber-coupling of high-brightness laser diode bars requires shaping and superposition of the images of the individual emitters on the fiber facet. Employment of micro-optical elements together with bulk-optical components enables the design and manufacturing of efficient coupling schemes with small form-factor. In this presentation we describe optical system design, manufacturing of micro-optical elements, system integration and characterization of two coupling schemes: The beam twister approach uses tilted cylindrical mirolens telescopes to rotate the images of the individual emitters by 90° with subsequent beam compression and focusing optics, while a skew ray coupling scheme applies an array of blazed diffractive elements in the pupil plane of a relay optics to superpose the images of the individual emitters. The optics design is based on raytracing procedures, taking into account diffractive effects, which could lower coupling efficiency. Micro-optical components are realized by polymer-on-glass replication of reflow lenses or grating structures manufactured by laser-lithography. System assembly is based on precise glueing with active alignment in the submicrometer range. We realized several optics schemes for coupling of high-power, high-brightness laser diode bars into fibers with 100µm core diameter. The systems are compared with each other with respect to achievable coupling efficiency, adjustment tolerances and pointing stability.

Paper Details

Date Published: 23 August 2005
PDF: 10 pages
Proc. SPIE 5876, Laser Beam Shaping VI, 587602 (23 August 2005); doi: 10.1117/12.616955
Show Author Affiliations
Peter Schreiber, Fraunhofer Institute for Applied Optics and Precision Mechanics (Germany)
Bernd Hoefer, Fraunhofer Institute for Applied Optics and Precision Mechanics (Germany)
Peter Dannberg, Fraunhofer Institute for Applied Optics and Precision Mechanics (Germany)
Uwe D. Zeitner, Fraunhofer Institute for Applied Optics and Precision Mechanics (Germany)


Published in SPIE Proceedings Vol. 5876:
Laser Beam Shaping VI
Fred M. Dickey; David L. Shealy, Editor(s)

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