OPTICAL STORAGE MEDIUM AND METHOD FOR MAKING SAME

摘要

In an optical storage medium comprising a plurality of thin film layers overlying a reflective substrate the thicknesses of the layers are selected to provide an optimum optical performance in response to a plurality of light wavelengths, in particular maximum absorption at the write wavelength frequency, 15% reflectance at the focus-sensing wavelength and low reflectance at the coarse positioning wavelength.