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Highly Efficient Double Tungstate Waveguide Lasers D. Geskus, K. van Dalfsen, F. Ay, K. Wrhoff, S. Aravazhi, and M. Pollnau

Summary: Highly Efficient Double Tungstate Waveguide Lasers
D. Geskus, K. van Dalfsen, F. Ay, K. Wörhoff, S. Aravazhi, and M. Pollnau
The potassium double tungstates KGd(WO4)2, KY(WO4)2, and KLu(WO4)2 are excellent candidates
for solid-state lasers, see Ref. [1] and Refs. therein, because of their high refractive index of ~2.0-
2.1, the large transition cross-sections of rare-earth (RE) ions doped into these hosts, the possibility
to incorporate very large concentrations of RE3+
ions, reaching the stoichiometric structure
KRE(WO4)2, a long inter-ionic distance of ~0.5 nm that allows for large doping concentrations
without lifetime quenching, and a reasonably large thermal conductivity of ~3.3 W m-1
. These
advantages have been exploited to demonstrate thin-disk lasers, broadly tunable and high-energy
ultrashort-pulse lasers, and low-quantum-defect lasers.
1. Lattice-matched, High-refractive-index-contrast Double Tungstate Waveguides
We apply liquid phase epitaxy at temperatures of ~920°C in a K2W2O7 solvent to grow RE3+
double tungstate thin layers onto undoped, (010)-orientated, laser-grade polished KYW substrates of
1 cm2
size, resulting in excellent layer and interface quality. After observing waveguiding in a
double tungstate [2], the first-ever laser operation of a double tungstate waveguide was demonstrated


Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente
Twente, Universiteit - Department of Science and Technology, Optical Techniques Group


Collections: Engineering