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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, and Xavier Mateos

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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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