Diffractive optical element and method for the design of a diffractive optical element
AssigneeSTMicroelectronics (Research & Development) Limited
InventorJames Peter Drummond Downing
Life of this patent
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Abstract
A diffractive optical element (DOE) is designed to implement both a collimation function with respect to an input divergent beam and a beam shaping function with respect to an output divergent beam. The phase designs of the collimation function and the beam shaping function are independently produced in the phase domain. These phase designs are then combined using a phase angle addition of the individual functions and wrapped between 0 and 2π radians. The diffractive surface of the DOE is then defined from the wrapped phase angle addition of the individual functions.
Claims18
A method for making a diffractive optical element which both collimates an input divergent beam and beam shapes an output divergent beam, comprising:
- designing in phase space a diffractive lens phase profile for collimating the input divergent beam;
- designing in phase space a beam shaping phase profile for producing the output divergent beam having certain output intensity distribution from a collimated input;
- summing the diffractive lens phase profile and the beam shaping phase profile in phase space to produce a combined phase profile;
- and
- wrapping the combined phase profile into 2π radians to define a wrapped phase profile defining a single physical diffractive surface relief profile of said diffractive optical element which both collimates and beam shapes;
- and
- producing a physical optic having said single physical diffractive surface.
A method, comprising:
- independently designing a first phase profile for a collimation function and a second phase profile for a beam shaping function;
- combining the independently designed first and second phase profiles using a phase angle addition to produce a summed phase profile;
- wrapping of the summed phase profile between 0 and 2π radians;
- and
- producing a physical optic using a single diffractive surface defined by the wrapped summed phase profile.
A method for making a diffractive optical element which both collimates an input divergent beam and beam shapes an output divergent beam, comprising:
- designing in phase space a diffractive lens phase profile for collimating the input divergent beam;
- designing in phase space a beam shaping phase profile for producing the output divergent beam having certain output intensity distribution from a collimated input;
- summing the diffractive lens phase profile and the beam shaping phase profile in phase space to produce a combined phase profile;
- wrapping the combined phase profile into 2π radians to define a wrapped phase profile;
- and
- converting the wrapped phase profile into a single physical diffractive surface relief profile of said diffractive optical element which both collimates and beam shapes.
Dependencies are inferred from the claim text.