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5 March 2008 High-power laser with Nd:YAG single-crystal fiber grown by micro-pulling down technique
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Abstract
We designed single-crystal fibers to combine excellent spectroscopic and thermo-mechanical properties of bulk crystals and ability of pump guiding and good heat repartition of doped glass fibers. Such single-crystal fibers of excellent optical quality were grown by the micro-pulling-down technique. A remarkable advantage of this technique is that pump guiding is achieved in the directly grown fiber without additional polishing on the cylinder. We designed 0.2%-Nd doped YAG crystal fibers sample of 50 mm and 1 mm diameter and AR coated on both end faces. It was longitudinally pumped by a fiber-coupled laser diode with a maximum output power of 120 W at 808 nm. Laser emission at 1064 nm was achieved inside a two concave mirrors cavity. We obtained 20 W of laser emission with a M2 quality factor of 6, for an incident pump power of 120 W and a slope efficiency of 18% without any thermal management problems. Besides, a power of 16 W with linearly polarized laser emission has been obtained under the same pump power by introducing a thin plate polarizer in the cavity. An acousto-optical modulator was inserted inside the cavity and 360 kW of peak power with 12 ns pulses at 1 kHz repetition rate were achieved under 60 W of pump power. This work shows real improvements of laser performances in directly grown single crystal fibers. A complete thermal study confirms a good heat management and demonstrates scalability to high average power laser sources.
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Damien Sangla, Nicolas Aubry, Julien Didierjean, Didier Perrodin, François Balembois, Kheirredine Lebbou, Alain Brenier, Patrick Georges, Jean Marie Fourmigue, and Olivier Tillement "High-power laser with Nd:YAG single-crystal fiber grown by micro-pulling down technique", Proc. SPIE 6871, Solid State Lasers XVII: Technology and Devices, 68710X (5 March 2008); https://doi.org/10.1117/12.762747
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