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When pumping at a short wavelength of 932 nm, the high gain obtained at the 981-nm zero-phonon line of a KY(WO4)2:Gd3+, Lu3+, Yb3+ planar waveguide resulted in efficient laser emission in an open cavity configuration.
The paper reports the laser emission from an enhanced-index-contrast KYW waveguide fabricated by co-doping the active layer with Lu and Gd ions. Both, Lu3+ and Gd3+ possess higher electron densities than Y3+, thus increasing the refractive index. The emission wavelength varied from 1010 nm to 1040 nm, strongly depending on the alignment, which was probably caused by the etalon effects of the gaps...
Using low-cost fabrication methods, liquid phase epitaxy and strip-loading a short fiber piece with a fluid, channel waveguide lasing is demonstrated in KY(WO4)2:Yb3+. Threshold is 82 mW, slope efficiency 30%, and output power 14 mW.
Waveguide lasing of monoclinic KY(WO4)2:Tm3+ grown by liquid-phase epitaxy is demonstrated in the 2 mum spectral range. The maximum continuous-wave output power achieved was 32 mW in the fundamental mode.
It has been recognized that the monoclinic double tungstates KY(WO4)2, KGd(WO4)2, and KLu(WO4)2 possess a high potential as rare-earth-ion-doped solid-state laser materials, partly due to the high absorption and emission cross sections of rare-earth ions when doped into these materials. Besides, their high refractive indexes make these materials potentially suitable for applications that require optical...
First channel waveguide emission from Yb-doped KY(WO4)2 has been demonstrated. Two different methods have been used to fabricate micron-size active-guiding structures, namely reactive ion etching and ion implantation.
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