Diode-pumped continuous-wave Nd:Gd^sub 3^Ga^sub 5^O^sub 12^ lasers at 1406, 1415 and 1423?nm

We report a diode-pumped continuous-wave Nd:Gd3Ga5O12 (GGG) laser operating at 1.4 μm spectral region. A dual-wavelength laser at 1423 and 1406 nm is achieved with output power of about 2.59 W at absorbed pump power of 13.4 W. Further increasing the pump power, simultaneous tri-wavelength laser at 1423, 1415 and 1406nm is also obtained with a maximum output power of 3.96W at absorbed pump power of 18.9W. Single-wavelength lasing is also realized at the three emission lines using an intracavity etalon. The laser result is believed to be the highest output power achieved in Nd:GGG crystal, at present, to the best of our knowledge.