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A novel polishing stop for accurate integration of potassium yttrium double tungstate on a silicon dioxide platform
Integrated Optics: Devices, Materials, and Technologies XXII
Rare-earth ion doped potassium yttrium double tungstate, RE:KY(WO 4 ) 2 , is a promising candidate for the realization of on-chip lasers and amplifiers. Two major bottlenecks difficult the realization of compact, high-contrast devices. Firstly, the crystal can only be grown on a lattice matched substrate, leading to a low (<2•10 -2 ) refractive index contrast between core and cladding. Secondly, the required thickness for the high-index contrast waveguides, ~1 µm, makes a lapping and polishingdoi:10.1117/12.2289955 fatcat:gvihsjopwfdcxomlng67dtmbr4