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US 2001/0033402 A1Published application
Switchable hologram and method of producing the same
OwnerMilan M. Popovichinventor
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OwnerMilan M. Popovichinventor
Estimating the term…
Disclosed are a holographic optical element (HOE) and a method of producing the HOE. In one embodiment of the method, a substrate is provided which is capable of recording a hologram or diffraction gratings. This substrate is illuminated with a first pair of light beams and a second pair of light beams. The first pair of light beams intersect within the substrate. The second pair of light beams also intersect within the substrate. Additionally, the first pair of light beams intersect at a region within the substrate where the second pair of light beams intersect. Normally, each of the first pair of light beams comprises light of a first wavelength, and each of the second pair of light beams comprises light of a second wavelength, where the first wavelength is different from the second wavelength.
A method of making a holographic optical element, the method comprising:
A holographic optical element (HOE) comprising a substrate with a hologram recorded therein, the hologram being formed by illuminating the substrate with first and second pairs of light beams, wherein the first pair of light beams intersect within the substrate, wherein the second pair of light beams intersect within the substrate, and wherein the first pair of light beams intersect at regions within the substrate where the second pair of light beams intersect.
An optical element comprising a substrate with diffraction gratings recorded therein, the diffraction gratings being formed by illuminating the substrate with first and second pairs of light beams, wherein each of the first pair of light beams comprises light of a first wavelength, wherein each of the second pair of light beams comprises light of a second wavelength, wherein first diffraction gratings are produced in the substrate in response the substrate being illuminated with the first pair of light beams, wherein second diffraction gratings are produced in the substrate in response the substrate being illuminated with the second pair of light beams, and wherein the diffraction gratings represent a superimposition of the first and second diffraction gratings.
Dependencies are inferred from the claim text.