The green light generation by self-frequency-doubled Yb:YCOB crystal
  Taking advantages of the broad emission bands of a Yb3+ doped calcium yttrium oxoborate (Yb:YCOB) crystal cut along the optimized direction out of principle planes with the maximum effective nonlinear coefficient, the self-frequency-doubled green light based on the self-frequency-doubling behavior of Yb:YCOB was achieved with a maximum output power of 710 mW at 523 nm. 
Qiannan Fang, Haohai Yu, Huaijin Zhang, Jiyang Wang
physics.optics