Abstract:A fiber2coupled diode array pumped Nd∶YAGcrystal ,type2I critical phase matching LBO crystal intra2cav2ity frequency doubled ,red laser at 660nm is reported in the paper.By using a short folded2cavity resonator ,with in2 jection pump power of 8W ,TEM00 mode red laser at 660nm of 1. 2W is obtained at last ,with the optical conversion efficiency up to 15 %.