The SHG from a colliding pulse mode-locked (CPM) unstable resonator Nd : YAG laser with a antiresonant ring structure is obtained by using intracavity frequency doubling of BBO crystal. The SHG energy conversion effiency of 50. 4% is measured .

• 本文报道用BBO晶体作为腔内倍频元件；在带抗共振环的对撞脉冲锁模非稳腔Nd:YAG激光器中实现腔内倍频激光输出；获得倍频能量转换效率为50.；4%25