Efficient and compact intracavity-frequency-doubled Nd : GdVO4/KTP laser end-pumped by a fiber-coupled laser diode

A compact and efficient diode-pumped intracavity-frequency-doubled Nd:GdVO4 /KTP green laser is demonstrated with a flat-hat cavity design. With a 1.3 at. % Nd3+-doped GdVO4 crystal and pumped at the weak-absorption peak of 80 6 nm, the second-harmonic output power at 532 nm was measured to be 1.95 W at an incident pump power of 8.4 W, corresponding to an optical conversion efficiency of 23.2%. The output characteristic at the fundamental wavelengt h of 1.063 mum was investigated with two different pump wavelengths. More t han 4.5-W output power was generated when the laser was pumped at 806.2 nm.