Optical element comprising at least one holographic diffusive element
AssigneeEssilor International
InventorsJean-Paul Cano, Aude Bouchier, Gilles Le Saux
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Abstract
An optical element is configured to be worn in front of an eye of a wearer. The optical element has two main surfaces and includes at least one holographic diffusive element having diffusive properties resulting from spatial variations of refractive index of said holographic diffusive element. The spatial variation of refractive index is greater than 0.001 at at least one given wavelength, on a distance less than 30 μm. An optical equipment includes the optical element and methods for recording a holographic medium onto an optical lens.
Claims15
An optical element configured to be worn in front of an eye of a wearer, the optical element having two main surfaces,
- wherein the optical element comprises at least one holographic diffusive element having diffusive properties resulting from spatial variations of refractive index of said holographic diffusive element, said spatial variation of refractive index being greater than 0.001 at at least one given wavelength, on a distance less than 30 μm.
An optical equipment configured to be worn in front of a wearer eye, comprising:
- an optical element wherein the optical element comprises at least one holographic diffusive element having diffusive properties resulting from spatial variations of refractive index of said holographic diffusive element, said spatial variation of refractive index being greater than 0.001 at at least one given wavelength, on a distance less than 30 μm;
- and
- a light source arranged to light at the at least one given wavelength on the at least one optical element.
A method for recording a holographic medium onto an optical lens, the method comprising:
- providing an unrecorded optical lens comprising a recording medium extending over an area of interest, the unrecorded optical lens having two main surfaces;
- providing a diffusive object;
- and
- recording a holographic diffusive element on the recording medium by simultaneously illuminating the area of interest with:
- a reference beam being a beam of coherent light, and
- an object beam being a beam of coherent light scattered through the diffusive object to obtain a recorded optical lens,
- wherein the diffusive object, the reference beam and the object beam are configured so that the recorded holographic diffusive element has diffusive properties resulting from spatial variations of refractive index of said holographic diffusive element, said spatial variation of refractive index being greater than 0.001 at at least one given wavelength, on a distance less than 30 μm.
A method for recording a holographic medium onto an optical lens, the method comprising:
- providing an unrecorded optical lens comprising a recording medium extending over an area of interest, the unrecorded optical lens having two main surfaces;
- modelling optical properties of a diffusive object;
- and
- recording a holographic diffusive element on the recording medium by simultaneously illuminating the area of interest with:
- a reference beam being a beam of coherent light, and
- an object beam simulating a beam of coherent light which would be scattered by the diffusive object to obtain a recorded optical lens,
- wherein the diffusive object, the reference beam and the object beam are configured so that the recorded holographic diffusive element has diffusive properties resulting from spatial variations of refractive index of said holographic diffusive element, said spatial variation of refractive index being greater than 0.001 at at least one given wavelength, on a distance less than 30 μm.
Dependencies are inferred from the claim text.