The fabricated gratings used for an 800-nm compressed laser pulse have more than 90%di?raction e?ciency in the–1st order for TE polarization within 760–860 nm,and the maximum value is 94.3%.The laserinduced damage threshold(LIDT)of the gratings increases from 0.53 to 0.75 J/cm2in the normal beam in a pulse widthτof 40–100 fs.The LIDT of the gratings is observed aτ0.25scaling in the pulse width region.The damage morphologies of the gratings indicate that the initial damage of the gratings locates at the grating lines,a position that coincides with that of the electric field maximum.
