Deep-red planar waveguide laser operation of Eu3+:KY(WO4)2 layers

Identifier:  imarina:9446687

Handle: https://hdl.handle.net/20.500.11797/imarina9446687

Authors:  Baillard A; Bae JE; Ceballos M; Loiko P; Solé RM; Aguiló M; Díaz F; Brasse G; Mateos X; Camy P

Abstract:
We report on the first deep-red europium planar waveguide laser. It employs 30-µm thick heavily-doped 11.5 at.% Eu:KY(WO4)2 layers grown by liquid phase epitaxy on undoped substrates using K2W2O7 as a solvent. When pumped with a green laser at 532 nm, the Eu-waveguide laser delivers a maximum output power of 7 mW at 704.7 nm with a slope efficiency of 9.5%, a laser threshold of 21 mW, and linear polarization. The waveguide propagation losses are as low as 0.05 dB/cm. The morphology, vibronic, and spectroscopic properties of the epitaxial layers are also studied. In the deep red, for the 5D0 → 7F4 transition, the stimulated-emission cross-section reaches 1.76 × 10−20 cm2 at 704.7 nm for light polarization E || Np, and the luminescence lifetime of the 5D0 manifold is 472 µs.