Dichroic coating for holographic data storage media

摘要

The invention provides a dichroic coating for holographic media. The dichroic coating is substantially non-reflective of light at a first wavelength and substantially reflective of light at a second wavelength. A holographic recording material of the medium can be formulated to be sensitive to the first wavelength of light, but generally insensitive to the second wavelength. A probe beam at the second wavelength can be used to interrogate the medium and identify tracking features.