BLAZE CONSIDERATIONS FOR MULTILAYER GRATINGS - SOME COMMENTS

The constant blaze angle that is an attribute of blazed, ruled, concav e diffraction gratings gives rise to a passband encompassing a range o f wavelengths that depends on the grating parameters. Adding a multila yer coating designed for a wavelength within the passband restricts th e passband approximately to that wavelength plus or minus the width of the multilayer rocking curve, which can be much smaller than the pass band of the uncoated grating.