Abstract: Optical thin films for LD-pumped Nd:YAG/LBO yellow laser at 556 nm are presented in this paper. To achieve 1 112 nm laser action and output 556 nm yellow laser with high power, the coating design of resonator mirrors was analyzed. The spectrum transmittance/reflectance request was reasonably distributed on the two resonator facet reflectivity to restrain the other laser lines such as 946 nm, 1 064 nm and 1 319 nm. The dielectric high reflective laser mirrors was achieved by double ion beam sputter technique for the first time, which was controlled by a time-power monitoring method. When the incident pump power was 2 W, CW 556 nm yellow laser output power of 102 mW was obtained. 