Abstract
We report on the frequency doubling of a tapered amplifier-boosted distributed-Bragg-reflector continuous-wave laser system at 795 nm, using a PPKTP crystal placed in an external ring cavity. A tunable 397.5 nm violet laser power of 130 mW with a mode-matched input 795 nm laser power of 416 mW is obtained (conversion efficiency η=31%), limited by thermally induced bistability. However, when the violet laser is at the maximum output, a stable operation more than 30 min is hard to reach due to thermal effects. With a scanning cavity, the peak violet laser power rises up to 180 mW, corresponding to an overall efficiency of η=43%. The generated 397.5 nm laser with good beam quality and satisfying power has huge potential use in quantum optics and cold-atom physics.
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