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23 August 2005 High-brightness fiber-coupling schemes for diode laser bars
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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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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); doi: 10.1117/12.616955; https://doi.org/10.1117/12.616955
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