Rare‐Earth‐Doped Y₂SiO₅ Crystal Directly Bonded on Glass for Efficient Optical Quantum Technologies Platform

Abstract

For high‐efficiency optical quantum technology platforms, bonding rare‐earth doped crystals on glass are of great interest, enabling the enhancement of the optical guided mode interaction with the active rare‐earth ions. Optical coherence lifetimes and stable operation are operated at very low temperature (3–4 K). Bonding should be preferably performed without adding any intermediate sticking layer in order not to hamper the optical mode distribution and propagation. Directly bonded Y2SiO5 crystal on a borosilicate glass is shown and the bonding mechanisms are discussed.