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US 12,298,530 B2Granted
Diffractive optical device providing structured light
AssigneeViavi Solutions Inc.
InventorsTasso R. M. Sales, Stephen H. Chakmakjian, George Michael Morris
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Abstract
A diffractive optical element including microstructures, along a surface of an optical material, having a phase profile to diffract input illumination into structured light of a plurality of different diffraction orders; wherein the phase profile is at least partially phase unwrapped is disclosed. Methods of generating the diffractive optical element is also disclosed.
Claims15
A diffractive optical element comprising:
- an array of unit cells along a surface of an optical material,
- wherein each unit cell includes microstructures having a phase profile that diffracts input illumination into structured light of a plurality of different diffraction orders;
- wherein the phase profile is a 2πP-partially unwrapped phase profile that is at least partially phase unwrapped, but less than a completely unwrapped phase profile, and is repeated in each unit cell of the array, the 2πP-partially unwrapped phase profile including discontinuities, the discontinuities being reduced compared to the completely wrapped phase profile;
- and
- wherein P is an integer that minimizes intensity of the zero diffraction order within a criteria of uniformity intensity error of the diffraction orders of structured light outputted from the diffractive optical element so that intensity of light in each of the plurality of diffraction orders is substantially the same, in the event a phase depth error is present in the phase profile.
2 more elements
A diffractive optical element comprising:
- microstructures, along a surface of an optical material, having a phase profile to diffract input illumination into structured light of a plurality of different diffraction orders;
- and
- wherein the phase profile is
- s
- =
- Φ
- P
- 2
-
- π
-
- λ
- 0
- (
- n
- -
- 1
- )
- ,
- where Φp is a 2πP-unwrapped phase profile that is at least partially phase unwrapped, but less than a completely unwrapped phase profile, n is an index of refraction of the surface, λ0 is a central wavelength, and P is an integer selected which minimizes intensity of the zero diffraction order within a criteria of uniformity intensity error of the diffraction orders of structured light outputted from the diffractive optical element so that intensity of light in each of the plurality of diffraction orders is substantially the same, in the event a phase depth error is present in the phase profile.
17 more elements
Dependencies are inferred from the claim text.