Near-stoichiometric lithium tantalate crystal has been grown from off-stoichiometric melt by adding K2O flux. The grown crystals were free from cracks and twins. The Curie temperature of the grown crystal was (673±0.4) ℃. A PI polyimide photoresist grating with duty cycle 60% was deposited on +Z surface of the wafer and LiCl saturated solution was used as liquid electrode. Homogenous periodically poled near-stoichiometric lithium tantalate (SLT) wafer with 0.5 mm thickness was fabricated by means of auto control poling technique. The duty cycle of the inverted domain was close to 50%. Optical experiment was done which the 1064 nm Nd+3YVO4 laser was used as the pump source.