Efficient intracavity sum-frequency generation of 490-nm radiation by use of potassium niobate

Abstract
Efficient sum-frequency generation of 910-nm radiation from a Ti:Al2O3 laser and the circulating 1064-nm light inside a diode-pumped Nd:YVO4 laser cavity has been achieved by use of b-axis KNbO3. Blue-green output of 20 mW was generated with 100 mW of mixing power (910 nm) and a Nd:YVO4 laser pumped by a 400-mW laser diode.