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We 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:LiYF4 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.
Pavel Loiko,Ludovic Gauthier-Manuel,Gurvan Brasse,Esrom Kifle,Lauren Guillemot,Alain Braud,Abdelmjid Benayad, andPatrice Camy
"Channel waveguide lasers in bulk Tm:LiYF4 crystal produced by deep diamond-saw dicing", Proc. SPIE 11357, Fiber Lasers and Glass Photonics: Materials through Applications II, 113571L (1 April 2020); https://doi.org/10.1117/12.2555054
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Pavel Loiko, Ludovic Gauthier-Manuel, Gurvan Brasse, Esrom Kifle, Lauren Guillemot, Alain Braud, Abdelmjid Benayad, Patrice Camy, "Channel waveguide lasers in bulk Tm:LiYF4 crystal produced by deep diamond-saw dicing," Proc. SPIE 11357, Fiber Lasers and Glass Photonics: Materials through Applications II, 113571L (1 April 2020); https://doi.org/10.1117/12.2555054