Qian Zhang, Liangbi Su, Dapeng Jiang, Fengkai Ma, Zhipeng Qin, Guoqiang Xie, Jiangang Zheng, Qinghua Deng, Wanguo Zheng, Liejia Qian, Jun Xu. Highly efficient continuous-wave laser operation of laser diode-pumped Nd,Y:CaF2 crystals[J]. Chinese Optics Letters, 2015, 13(7): 071402