Abstract
We report on the fabrication of annular cladding waveguides in Nd:YAG laser crystal by using femtosecond laser inscription. The circular cross sections of the optical waveguides were in dual-cladding and tri-cladding shapes with different diameters. Under the optical pump at 808nm, the generated continuous-wave lasers at 1064nm have been realized in the annular cladding waveguides. For dual-cladding and tri-cladding waveguides, the slope efficiencies of the waveguide lasers were calculated to be 21.3% and 20%, and the maximum output powers measured were 82mW and 84mW, respectively. In addition, the annular modal profiles were obtained for these cladding waveguides.
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