Fiber coupling of single-mode laser diodes with power-density conservation

Michael Schubert; Lars C. Berger; Uwe Brauch; Adolf Giesen; Hans Opower; Klaus Wittig

doi:10.1117/12.237653

12 April 1996 Fiber coupling of single-mode laser diodes with power-density conservation

Michael Schubert, Lars C. Berger, Uwe Brauch, Adolf Giesen, Hans Opower, Klaus Wittig

Proceedings Volume 2682, Laser Diodes and Applications II; (1996) https://doi.org/10.1117/12.237653
Event: Photonics West '96, 1996, San Jose, CA, United States

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

Citation Download Citation

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); https://doi.org/10.1117/12.237653

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