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12 April 1996 Fiber coupling of single-mode laser diodes with power-density conservation
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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
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Schubert, Lars C. Berger, Uwe Brauch, Adolf Giesen, Hans Opower, and Klaus Wittig "Fiber coupling of single-mode laser diodes with power-density conservation", Proc. SPIE 2682, Laser Diodes and Applications II, (12 April 1996);

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