Abstract
ABSTRACT We comparatively studied laser perform ance in the mixed vanadate crystals Nd:Y x Gd 1-x VO 4 with direct and indirect pumping. The maximum CW output power at 1064 nm was measured to be 6.6 W with 12 W direct 880 nm laser diode pumping, and 4.4 W w ith 8.8 W indirect 808 nm pumping. The optical conversion efficiency depended on the mixture ratio (x), pumping wavelength (direct or indirect), and pumping power. The hightest optical efficiency of 59% and slope efficiency of 74% were achived. Keywords: solid state lasers; mixed vanadate crystals; direct excitation; indirect excitation; laser efficiency. 1. INTRODUCTION Neodymium doped vanadate crystal Nd:YVO 4 has been a favorite laser crystal for highly efficient laser systems [1-4] for many years because of its large emission cross section and high absorpti on coefficient with diode pumping, whereas the newer laser crystal Nd:GdVO 4 is considered [5,6] as having similar laser gain and pump absorption properties as Nd:YVO
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