Abstract

We present first results in applying the thin-disk concept to lasers directly emitting in the visible spectral range. The pump light was provided by 24 InGaN laser diodes emitting 1 W each at 444 nm, which were coupled into a 200 μm fiber. A 300 μm thin ${\mathrm{Pr}}^{3+}$,${\mathrm{Mg}}^{2+}\text{:}{\mathrm{SrAl}}_{12}{\mathrm{O}}_{19}$ crystal served as gain medium. In continuous-wave operation an output power of 0.88 W and a slope efficiency of 12% with respect to the absorbed pump power were achieved at an emission wavelength of 643.5 nm. Modulating the pump source at a duty cycle of 10% yielded an instantaneous output power of 1.67 W, corresponding to a slope efficiency of 26%.

© 2014 Optical Society of America

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