Generation of 5 W continuous-wave green power at 531 nm based on a frequency-doubled Nd:GdVO_4 micro-laser pumped into the emitting level at 879 nm

摘要

The continuous-wave high power laser emission of Nd:GdVO_4 at the fundamental wavelength of 1.06 μm and its 531-nm second-harmonic obtained by intracavity frequency-doubling with a LBO nonlinear crystal is investigated under pumping by diode laser on the ~4I_(9/2)→~4F_(5/2) transition, at 808 nm, and on the ~4I_(9/2)→~4F_(3/2) transition, at 879 nm. 5.1 W at 531 nm with overall optical-to-optical efficiency of 0.31 was obtained from a 3-mm-thick 1.0-at.% Nd:GdVO_4 laser medium and a 10-mm-long LBO nonlinear crystal. A careful alignment of the laser enables emission almost free of chaotic intensity fluctuations.