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Open AccessCommunication

Lapping and Polishing of Crystalline KY(WO4)2: Toward High Refractive Index Contrast Slab Waveguides

Optical Sciences, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
Techno Centrum voor Onderwijs en Onderzoek, Glas instrumentmakerij, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
Currently at PHIX, De Veldmaat 17, 7522 NM Enschede, The Netherlands
Author to whom correspondence should be addressed.
Micromachines 2019, 10(10), 674;
Received: 12 September 2019 / Revised: 1 October 2019 / Accepted: 2 October 2019 / Published: 4 October 2019
Rare-earth ion-doped potassium yttrium double tungstate, RE:KY(WO4)2, is a promising candidate for small, power-efficient, on-chip lasers and amplifiers. Thin KY(WO4)2-on-glass layers with thicknesses ranging between 0.9 and 1.6 μm are required to realize on-chip lasers based on high refractive index contrast waveguides operating between 1.55 and 3.00 µm. The crystalline nature of KY(WO4)2 makes the growth of thin, defect-free layers on amorphous glass substrates impossible. Heterogeneous integration is one of the promising approaches to achieve thin KY(WO4)2-on-glass layers. In this process, crystal samples, with a thickness of 1 mm, are bonded onto a glass substrate and thinned down with an extensive lapping and polishing procedure to the desired final thickness. In this study, a lapping and polishing process for KY(WO4)2 was developed toward the realization of integrated active optical devices in this material. View Full-Text
Keywords: integrated optics; heterogeneous integration; lapping; polishing integrated optics; heterogeneous integration; lapping; polishing
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van Emmerik, C.I.; Kooijman, R.; Dijkstra, M.; Garcia-Blanco, S.M. Lapping and Polishing of Crystalline KY(WO4)2: Toward High Refractive Index Contrast Slab Waveguides. Micromachines 2019, 10, 674.

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