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• W2777834385 abstract "Rare-earth ion doped potassium yttrium double tungstate, RE:KY(WO4)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 polishing approach very challenging. In this work we propose a novel polishing stop that will permit to accurately control the final thickness of the KY(WO4)2 waveguide within a few tens of nanometers. A 1 mm thick KY(WO4)2 substrate is flip-chip bonded with an adhesive layer onto a SiO2 substrate. Afterwards a low temperature pulsed laser deposited (PLD) Al2O3 layer - with the desired final thickness of the KY(WO4)2 waveguide core - is deposited on top of the assembly. The sample is then thinned using a multistep lapping and polishing procedure. Earlier work with a polishing stop made from SiO2, showed a decrease of the polishing speed with a factor 3-4, allowing the termination of the process within a tolerance of a few tens of nanometers." @default.
• W2777834385 created "2018-01-05" @default.
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• W2777834385 date "2018-02-23" @default.
• W2777834385 modified "2023-09-26" @default.
• W2777834385 title "A novel polishing stop for accurate integration of potassium yttrium double tungstate on a silicon dioxide platform" @default.
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• W2777834385 doi "https://doi.org/10.1117/12.2289955" @default.
• W2777834385 hasPublicationYear "2018" @default.
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