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Optica Publishing Group
  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CA1_5

Efficient Gd3+, Lu3+ co-doped KY(WO4)2:Tm3+ channel waveguide lasers

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Integrated planar and channel waveguide lasers in the KY(WO4)2 (= KYW) host material is a subject of heavy investigation. Waveguide lasers based on Yb3+-doped KYW with slope efficiencies as high as 82.3% and output powers of several hundreds of milli-Watts have demonstrated the potential for highly efficient integrated lasers in this material, as well as low thresholds [1, 2]. Recently, lasers based on Tm3+-doped KYW with planar and channel geometries reported maximum slope efficiencies of 13% and maximum output powers of 32 mW [3, 4]. The higher efficiencies of the lasers based on Yb3+ compared to the ones based on Tm3+ can partly be attributed to the absence of detrimental up-conversion effects in Yb3+. However, slope efficiencies of 44% and 68% in thulium-doped bulk KGd(WO4)2 crystals and also fiber lasers suggest that there is significant room for improvement in terms of slope efficiency in thulium-doped KYW [5, 6].

© 2011 Optical Society of America

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