Channel waveguide lasers in bulk Tm -LiYF4 produced by deep diamond-saw dicing
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2020-07-26 |
| Journal | Optics Express |
| Authors | Pavel Loiko, Ludovic GauthierâManuel, Gurvan Brasse, Esrom Kifle, Lauren Guillemot |
| Institutions | Centre de Recherche sur les Ions, les MatĂ©riaux et la Photonique, Franche-ComtĂ© Ălectronique MĂ©canique Thermique et Optique - Sciences et Technologies |
| Citations | 8 |
Abstract
Section titled âAbstractâWe report on a novel approach to fabricate channel (ridge) waveguides (WGs) in bulk crystals using precision diamond saw dicing. The channels feature a high depth-to-width aspect ratio (deep dicing). The proof-of-the-concept is shown for a Tm 3+ :LiYF 4 fluoride crystal. Channels with a depth of 200 ”m and widths of 10-50 ”m are diced and characterized by confocal laser microscopy revealing a r.m.s. roughness of the walls well below 100 nm. The channels obtained possess waveguiding properties at âŒ815 nm with almost no leakage of the guided mode having a vertical stripe intensity profile into the bulk crystal volume and relatively low propagation losses (0.20-0.43 dB/cm). Laser operation is achieved in quasi-CW regime by pumping at 780 nm. The maximum peak output power reaches 0.68 W at âŒ1.91 ”m with a slope efficiency of 53.3% (in Ï-polarization). The proposed concept is applicable to a variety of laser crystals with different rare-earth dopants.