Abstract
CW mirrorless laser operation at 1840 nm at room temperature was observed in buried rib waveguides of KY 0.58Gd 0.22Lu 0.17Tm 0.03(WO 4) 2 fabricated by structuring KY(WO 4) substrates by Ar-ion milling and subsequent liquid phase epitaxial growth of the active layer on these substrates. Laser efficiency and laser threshold seems to change with the width of the channels fabricated.
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