Applied Physics B

, Volume 49, Issue 3, pp 269–273

Continuous wave 1.6 μm laser action in Er doped garnets at room temperature⋆

  • H. Stange
  • K. Petermann
  • G. Huber
  • E. W. Duczynski
Contributed Papers

Abstract

We report on room-temperature cw laser action of Er3+: Yttrium-aluminum-garnet (YAG) and Er3+: Yttrium-gallium-garnet (YGG) crystals at 1.64 μm. The laser operates from the metastable4I13/2 manifold into an upper Stark level of the4I15/2 ground-state manifold of Er3+. Due to reabsorption losses, the Er3+ concentration of the laser crystals must be low. Laser pumping at a wavelength of 647.1 nm yields lowest thresholds around 30 mW and slope efficiencies up to 12.7% for Er:YAG. Laser operation in Er:YGG is achieved with higher thresholds of about 200 mW and smaller slope efficiencies of 0.9%. The effective emission cross section in YAG is estimated to be σe≈5×10−21 cm2.

PACS

42.55 78.45 78.55 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • H. Stange
    • 1
  • K. Petermann
    • 1
  • G. Huber
    • 1
  • E. W. Duczynski
    • 2
  1. 1.Institut für Angewandte Physik, UniversitätHamburg 36Fed. Rep. Germany
  2. 2.Lasertec Hamburg GmbHHamburg 50Fed. Rep. Germany

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