Focusing the laser beam into a 9 mm long BBO crystal, the second harmonic of 1. 2 W was generated with conversion efficiency of 13%. When the filtering aperture was removed, the conversion efficiency fell down to 8%.

• 将这一光束聚焦到长9mm的BBO晶体中；获得了1.；2W的倍频光；其转换效率为13%25；当移去滤波小孔后；所产生的倍频效率下降到8%25。