Continuous-Wave Green Laser of 9.9W by Intracavity Frequency Doubling in Laser-Diode Single-End-Pumped Nd:YVO₄/LBO

A maximum of 9.9W cw TEM₀₀ output at 532nm laser has been obtained by intracavity frequency doubling with LBO in laser-diode single-end-pumped Nd:YVO₄. The Nd:YVO₄/LBO green laser has a simple three-mirror V-fold cavity structure. The optical-optical conversion efficiency was 34.8%. Based on the equation of thermal conduction, a general solution for the laser-crystal interior temperature distribution is obtained by the semi-analytical thermal analysis method. Using the software system, the cavity parameters have been optimized according to the stability condition and the astigmatic compensation principle. The astigmatism in the cavity has been effectively controlled and the resonator was insensitive to the thermal lens in the Nd:YVO₄ crystal.