Journal
APPLIED PHYSICS EXPRESS
Volume 15, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1882-0786/ac3d1d
Keywords
Visible laser; Fiber Laser; Dy-doped silica glass
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The co-doping of Ge in Dy3+-doped silica fiber is shown to reduce loss, suppress photodarkening, and increase slope efficiency in visible laser oscillation. With an optimal composition, a slope efficiency of 22.0% at 582.5 nm and a maximum output power of 18.4 mW were achieved.
We present the first demonstration of visible laser oscillation in the Dy3+-doped silica fiber pumped by a 451 nm InGaN laser diode. It was found that Ge-co-doping plays the following important roles of laser oscillation: (1) to reduce the Rayleigh scattering loss, (2) to suppress the X-ray-induced and pump-induced photodarkening (PD), and (3) to increase lasing slope efficiency. In a fiber with 0.46 wt% Dy, 1.8 wt% Ge, and 0.54 wt% Al, the slope efficiency is 22.0% at 582.5 nm, and the maximum output power is 18.4 mW.
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