Efficient channel waveguide lasers based on thulium-doped double tungstates


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Dalfsen van, K. and Aravazhi, S. and Geskus, D. and Garcia Blanco, S.M. and Wörhoff, K. and Pollnau, M. (2011) Efficient channel waveguide lasers based on thulium-doped double tungstates. In: Annual Symposium of the IEEE Photonics Benelux Chapter 2011, 1-2 December 2011, Ghent, Belgium.

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Abstract:Monoclinic double tungstates, KY(WO4)2 (= KYW), co-doped with Gd3+, Lu3+and various Tm3+ concentrations of 1.5 - 8.0% were grown onto pure KYW substrates by liquid-phase epitaxy. Ridge-type channel waveguides were microstructured 1.5 μm deep by Ar+-beam milling and overgrown with pure KYW. Lifetime measurements on the upper laser level (3F4) were performed for the different concentrations. Laser experiments on the 1.5% Tm3+-doped channel waveguides revealed slope efficiencies as high as 31.5% and output powers up to 149 mW. Through measurements of the laser relaxation-oscillation frequency, an upper value of ~0.11 dB/cm for the waveguide propagation loss at the laser wavelength was determined.
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Electrical Engineering, Mathematics and Computer Science (EEMCS)
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