We report a high-beam-quality diode-side-pumped Nd:YAG intracavity-frequency-doubled laser.The thermal lensing effect of Nd:YAG laser is compensated by using concave crystal rod.We have designed a convex-convex cavity based on the thermal focal length of the laser module to control the beam quality of the fundamental frequency laser.An acousto-optic Q-switching is used to modulate the fundamental frequency laser,and a type-Ⅱ critical phase-matched lithium borate(LBO)crystal is used to generate frequency doubled laser.At a pump current of 21 A and a repetition frequency of 9 kHz,we obtain a 532 nm laser with an average power of 21.1 W and a pulse width of 60 ns.At maximum average power of the 532 nm laser,the beam quality has been measured to be Mx2×My2=1.33×1.36,and the power stability fluctuation within 1 hour is less than 3％.
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