Laser operation and computation of thermal stress in endpumped 1.1 at.% Nd-doped yttrium aluminium garnet rods with sub-millimetre diameters |
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| Authors: | Sergei Vatnik Reda El-Agmy Thomas Graf |
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| Affiliation: | 1. Institute of Laser Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia;2. e-mail: vatnik@laser.nsc.ru;3. Institute of Applied Physics, CH-3012 Bern, Switzerland |
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| Abstract: | Laser operation of a fibre-like 1.1 at.% Nd-doped yttrium aluminium garnet rod with a diameter of 0.34 mm and a length of 4.7 mm has been demonstrated. The fibre was end pumped with 0.5 W of continuous-wave radiation from a laser diode emitting at 808 nm. The measured laser thresholds are in a reasonable agreement with theoretical estimations. The distributions of temperature and stress in the crystal fibre were calculated with finite-element simulations showing that the fibre can be pumped up to a power of 40–50 W without fracture caused by thermal stress. The advantages and disadvantages of the proposed laser rod design are discussed. |
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