High-brightness fiber-coupling schemes for diode laser bars

Peter Schreiber; Bernd Hoefer; Peter Dannberg; Uwe D. Zeitner

doi:10.1117/12.616955

23 August 2005 High-brightness fiber-coupling schemes for diode laser bars

Peter Schreiber, Bernd Hoefer, Peter Dannberg, Uwe D. Zeitner

Proceedings Volume 5876, Laser Beam Shaping VI; 587602 (2005) https://doi.org/10.1117/12.616955
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Peter Schreiber, Bernd Hoefer, Peter Dannberg, and Uwe D. Zeitner "High-brightness fiber-coupling schemes for diode laser bars", Proc. SPIE 5876, Laser Beam Shaping VI, 587602 (23 August 2005); https://doi.org/10.1117/12.616955

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