LD-pumped sum-frequency in 593 nm yellow laser

An efficient method of 593 nm yellow laser with a single LD pump source and Nd:YVO4 double crystals was reported. The theory was analyzed, the experiment device was designed and the experiment result was verified. The device was composed of laser diode, optical coupling system, Nd:YVO4 crystals, plan-curved mirror, LBO and totally reflecting mirror. By using V-type resonant cavity, with incident pump source with the 5 W power and the 808.7 nm wavelength, the experiment adopts typeⅠcritical phase-matched LBO as sum-frequency crystal, and the 244 mW yellow laser at 593 nm was obtained. The optical to optical conversion efficiency was 4.9%, the laser instability was about 5%. The experiment result shows that the intra-cavity sum-frequency in V-type resonant cavity can obtain 593 nm laser, and the method has structure compact and high conversion efficiency advantages, and can be used in many sum-frequency laser.