1.Spectral beam splitting beam is coated; 

2.The angle of incidence is 45°±1.5°;the reflectivity R(1.070μm-1.09μm)is more than 99.5%;the laser damage threshold should be more than 5000W/cm2;the absorptivity in the 1.08μm is less than 0.01%;the average transmissivity in the 480nm to 660nm wave band is more than 90%;the surface accuracy of the coated reflecting surface is better than λ/6(P-V),λ/40(RMS); the test wavelength is 632.8nm. 

3.The power density is 5000W/cm² .