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Scalable concept for diode-pumped high-power solid-state lasers

  • Advanced Optically Pumped Solid-State Lasers
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Abstract

A new, scalable concept for diode-pumped high-power solid-state lasers is presented. The basic idea of our approach is a very thin laser crystal disc with one face mounted on a heat sink. This allows very high pump power densities without high temperature rises within the crystal. Together with a flat-top pump-beam profile this geometry leads to an almost homogeneous and one-dimensional heat flux perpendicular to the surface. This design dramatically reduces thermal distortions compared to conventional cooling schemes and is particularly suited for quasi-three-level systems which need high pump power densities. Starting from the results obtained with a Ti:Sapphire-pumped Yb:YAG laser at various temperatures, the design was proved by operating a diode-pumped Yb:YAG laser with an output power of 4.4 W and a maximum slope efficiency of 68%. From these first results we predict an exctracted cw power of 100 W at 300 K (140 W at 200 K) with high beam quality from a single longitudinally pumped Yb: YAG crystal with an active volume of 2 mm3. Compact diode-pumped solid-state lasers in the kilowatt range seem to be possible by increasing the pump-beam diameter and/or by using several crystal discs.

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Authors and Affiliations

  1. Institut für Strahlwerkzeuge, Universität Stuttgart, Pfaffenwaldring 43, D-70569, Stuttgart, Germany

    A. Giesen, H. Hügel, A. Voss & K. Wittig

  2. Deutsche Forschungsanstalt für Luft- und Raumfahrt, Institut für Technische Physik, Pfaffenwaldring 38-40, D-70569, Stuttgart, Germany

    U. Brauch & H. Opower

Authors
  1. A. Giesen
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  2. H. Hügel
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  3. A. Voss
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  4. K. Wittig
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  5. U. Brauch
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  6. H. Opower
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Giesen, A., Hügel, H., Voss, A. et al. Scalable concept for diode-pumped high-power solid-state lasers. Appl. Phys. B 58, 365–372 (1994). https://doi.org/10.1007/BF01081875

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  • DOI: https://doi.org/10.1007/BF01081875

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