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Proceedings Paper

Fiber coupling of single-mode laser diodes with power-density conservation
Author(s): Michael Schubert; Lars C. Berger; Uwe Brauch; Adolf Giesen; Hans Opower; Klaus Wittig
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Paper Abstract

Laser diodes with diffraction limited beam quality offer high power densities of the order of iO - 108 W/cm2, but are limited in output power to some Watts. Scaling to higher powers without using a solidstate laser converter has to be realized by incoherent superposition of the outputs of a number of laser diodes. For that the radiation of single-mode laser diodes is coupled into single-mode fibers which at the other end are shaped into a bundle of hexagonal symmetry. The radiation leaving the fiber bundle is collimated with an array of achromats and focused with an additional lens onto the target. With 19 fibercoupled 690-nm diodes (TOLD 915 1, 20 mW at the fiber end) a total cw power of 338 mW in a spot of 19.4 jim diameter (at I/Is = l/e2of a nearly Gaussian cross section) was achieved. The peak power density was 263 kW/cm2, which is approximately 1 .7 times that of a single fiber. Optimizing the filling factor should further increase the power density. Keywords: single-mode lasers diodes, single-mode fibers, scalable system. incoherent coupling

Paper Details

Date Published: 12 April 1996
PDF: 8 pages
Proc. SPIE 2682, Laser Diodes and Applications II, (12 April 1996); doi: 10.1117/12.237653
Show Author Affiliations
Michael Schubert, Institut fur Technische Physik/DLR (Germany)
Lars C. Berger, Institut fur Technische Physik/DLR (Germany)
Uwe Brauch, Institut fur Technische Physik/ DLR (Germany)
Adolf Giesen, Univ. Stuttgart (Germany)
Hans Opower, Institut fur Technische Physik/DLR (Germany)
Klaus Wittig, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 2682:
Laser Diodes and Applications II
Kurt J. Linden; Prasad R. Akkapeddi, Editor(s)

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