High Efficient Laser Operation of the Nd:KGd(WO₄)₂ Crystal Grown by Flux Method

The laser performance of Neodymium-doped potassium gadolinium tungstate (Nd:KGd(WO₄)₂) crystal was studied by using Ti:Sapphire laser as the pump source. The maximum optical-to-optical efficiencies for the 1.067 and 1.3 μm laser outputs were measured to be 60% and 32.3%, respectively. The internal loss coefficient of the crystal for 1.067 μm laser was estimated to be as low as 0.004 cm^-1. The oscillation thresholds at 1.067 and 1.3 μm for different output transmittances are also given.