Research On Green And Blue High Statblity Solid-State Laser

High-stability solid-state laser has important application in laser ranging, optical metrology, interferometry etc. In this paper, the theoretic and experimental studies on the technique for enhance the power stability of green and blue laser were presented.From the rate equation, the noise and the temperature characteristics of laser, the factors affecting the green and blue laser power stability were analyzed. Laser crystal and nonlinear crystal in DPSSL have been researched in detail. The principle of F-P quartz etalon and the theoretical foundation of reduce the reabsorption losses in quasi- three-energy level system to improve blue laser power stability have been focus on analyzed.In respect of experiments, green laser has been realized by, respectively, LBO and KTP doubling frequency crystal. The green laser output power is about 250mW and 300mW. The experimental results showed that the noise of the green laser with type II phase-matched crystal was larger than that with type I phase matching crystal, so the power stability is low. Using a 0.4mm Fabry-Perot etalon as the frequency selector, 68mW single-longitudinal mode green laser was obtained. In blue laser , we usded 2wLD pumped 2mm thick Nd:YAG and 3WLD pumped 1mm thick Nd:YAG respectively, correspond to the power stability in 2 hour was 11.90% and 7.69% . The blue laser noise and power statblity in case of reduce reabsorption loss were analysed and compared. At last ,by optoelectronic power feedback controlling scheme a high stability green laser was realized. The output power was 240mW and the power stability in 2 hour was±0.15%.