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Open AccessCommunication

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

1
Optical Sciences, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
2
Techno Centrum voor Onderwijs en Onderzoek, Glas instrumentmakerij, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
3
Currently at PHIX, De Veldmaat 17, 7522 NM Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(10), 674; https://doi.org/10.3390/mi10100674
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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