Abstract:Active media with high rare-earth concentrations are essential for small-footprint waveguide amplifiers. When operating at high population inversion, such devices are often affected by undesired energy-transfer processes and thermal effects. In this work, we study a 32-µm-thick epitaxial layer of potassium gadolinium ytterbium double tungstate with a high Yb content of 57at.%, representing an Yb 3+ concentration of ~3.8 × 10 21 per cubic centimeter, grown onto an un-doped KY(WO4)2 substrate. The pump absorptio… Show more
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