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. 2023 Dec 1;48(23):6212-6215.
doi: 10.1364/OL.507073.

Orange surface waveguide laser in Pr:LiYF4 produced by a femtosecond laser writing

Amandine Baillard, Pavel Loiko, Carolina Romero, Víctor Arroyo, Javier Rodríguez Vázquez de Aldana, Michaël Fromager, Abdelmjid Benayad, Alain Braud, Patrice Camy, Xavier Mateos

Orange surface waveguide laser in Pr:LiYF4 produced by a femtosecond laser writing

Amandine Baillard et al. Opt Lett. .

Abstract

Depressed-cladding surface channel waveguides were inscribed in a 0.5 at.% Pr:LiYF4 crystal by femtosecond Direct Laser Writing. The waveguides consisted of a half-ring cladding (inner diameter: 17 µm) and side structures ("ears") improving the mode confinement. The waveguide propagation loss was as low as 0.14 ± 0.05 dB/cm. The orange waveguide laser operating in the fundamental mode delivered 274 mW at 604.3 nm with 28.4% slope efficiency, a laser threshold of only 29 mW and linear polarization (π), representing record-high performance for orange Pr waveguide lasers.

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