Study of color separation phase grating used for ICF drivers

With the use of the theory of blazed phase gratings,the color separation phase grating used for ICF drivers is designed,which can off-axis separate the fundamental,2nd and 3rd harmonic waves.Theoretically,its diffraction efficiency for 0'th order at the 3rd harmonic wave is 100%.Experimentally,a color separation grating is made.Both its separation angles (at the 1st and 2nd harmonic waves) and its diffraction efficiencies for 0'th order are measured,and some significant results are presented.