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Optica Publishing Group
  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CE3_2

Growth and characterization of highly Yb3+-doped KY(WO4)2 thin layers

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Crystals of the monoclinic double tungstates KY(WO4)2 (= KYW), KGd(WO4)2, and KLu(WO4)2 are excellent laser host materials due to their high refractive indices on the order of 2, good thermal conductivity, and large transition cross-sections of rare-earth ions, in particular Yb3+, doped into these crystals. Yb3+-doped double tungstate thin layers enable lasing with a small quantum defect [1] and high slope efficiency [2], making them well suited for high-power lasers [3] and waveguide lasers [4]. Co-doping KYW:Yb3+ layers with appropriate amounts of Lu3+ and Gd3+ increases the refractive index contrast with respect to the undoped KYW substrate, thus reducing the required layer thickness for waveguiding, while simultaneously providing lattice matching between layer and substrate [5]. On the other hand, for thin-disk laser applications highly Yb3+-doped KYW layers are needed. This can be achieved by either growing KLu(WO4)2:Yb3+ layers on undoped KLu(WO4)2 substrates because of the similar ion radii of Yb3+ and Lu3+ [3] or co-doping a KYW:Yb3+ layer with Gd3+ for compensating the induced lattice mismatch with respect to the undoped KYW substrate.

© 2011 Optical Society of America

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