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

Identifier:  imarina:9452166

Handle: https://hdl.handle.net/20.500.11797/imarina9452166

Authors:  Baillard, A; Bae, JE; Ceballos, M; Loiko, P; Sole, RM; Aguilo, M; Diaz, F; Brasse, G; Mateos, X; Camy, P

Abstract:
We report on the first deep-red europium planar waveguide laser. It employs 30-mu m 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 Euwaveguide 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 x 10-20 cm2 at 704.7 nm for light polarization E || Np, and the luminescence lifetime of the 5D0 manifold is 472 mu s. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.