Research on Characteristics of KTiOPO4 Crystal Applied in Red Laser

Abstract. In this paper, the range of frequency doubling wavelengths is analyzed through KTiOPO4 (KTP) dispersion research.The best phase-matching angle of KTP crystal for frequency doubling at 1319nm is calculated as well as the effective nonlinear coefficient.Thus the KTP cutting method is determined.In the experiments,we use the crystal which is 7×7×7mm for frequency doubling at 1319nm to achieve 660nm red laser.Then we get the optical spectrum with a triple prism and measure the two wave energy with two pyroelectric detectors.The frequency doubling efficiency can reach 34.3%.This demonstrates that the experimental system is with good stability