Physics – Optics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5876....1s&link_type=abstract
Laser Beam Shaping VI. Edited by Dickey, Fred M.; Shealy, David L. Proceedings of the SPIE, Volume 5876, pp. 1-10 (2005).
Physics
Optics
Scientific paper
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.
Dannberg Peter
Hoefer Bernd
Schreiber Peter
Zeitner Uwe D.
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