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Rare-earth ion-doped potassium yttrium double tungstate, RE:KY(WO 4 ) 2 , is a promising candidate for small, power-efficient, on-chip lasers and amplifiers. Thin KY(WO 4 ) 2 onglass layers with thicknesses ranging between 0.9 and 1.6 m 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(WO 4 ) 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(WO 4 ) 2 onglass 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(WO 4 ) 2 was developed toward the realization of integrated active optical devices in this material.

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