Channel waveguide lasers in bulk Tm -LiYF4 crystal produced by deep diamond-saw dicing
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2020-04-01 |
| Authors | Pavel Loiko, Ludovic GauthierâManuel, Gurvan Brasse, Esrom Kifle, Lauren Guillemot |
| Institutions | Centre National de la Recherche Scientifique, Université Marie et Louis Pasteur |
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:LiYF<sub>4</sub> fluoride crystal. Channels with a depth of 200 μm and widths of 10-50 μm are diced and characterized with a confocal laser microscopy revealing a r.m.s. roughness of the walls of about 1 μm. The passive waveguiding properties of the channels are proven at ~815 nm showing almost no leakage of the guided mode into the bulk crystal volume. The laser operation is achieved in quasi-CW regime. The maximum peak output power reaches 0.68 W at ~1.91 μm with a slope efficiency of 53.3% (in σ-polarization). The laser mode has a vertical stripe intensity profile. The proposed concept is applicable to a variety of laser crystals with different rare-earth dopants and it is promising for sensing applications.