Device and method for homogenizing optical beams
A device for homogenizing optical beams contains at least one optically functional boundary surface through which a beam to be homogenized can pass or at which a beam to be homogenized can be reflected. A plurality of lens elements or mirror elements are disposed on the at least one optically functional boundary surface. The lens elements or the mirror elements each have such a curvature in their edge regions that diffraction-related effects are reduced as a result.
1 . A device for homogenizing optical beams, comprising:
at least one optically functional boundary surface through which a beam to be homogenized can pass or at which the beam to be homogenized can be reflected; and
a plurality of elements, selected from the group consisting of lens elements and mirror elements, disposed on said at least one optically functional boundary surface, said elements each having an edge region with a curvature for reducing diffraction-related effects.
2 . The device according to claim 1 , wherein said elements each have a central region having a cross section corresponding substantially to a second order aspherical cross section.
3 . The device according to claim 1 , wherein said edge region of each of said elements has a cross section deviating from a second order aspherical cross section.
4 . The device according to claim 1 , wherein said edge region of each of said elements has a cross section dominated by relatively high orders of a polynomial.
5 . A device for homogenizing optical beams, comprising:
at least one optically functional boundary surface through which a beam to be homogenized can pass or at which the beam to be homogenized can be reflected; and
a plurality of elements, selected from the group consisting of lens elements and mirror elements, disposed on said at least one optically functional boundary surface, each of said elements has a structure selected from the group consisting of a wave-shaped structure and a sinusoidal structure.
6 . The device according to claim 5 , wherein a periodicity of said structure is smaller, in particular small compared to the periodicity, with which individual ones of said elements are disposed one next to another.
7 . The device according to claim 5 , wherein each of said elements has a base structure on which said structure is based and is second order spherical or aspherical.
8 . The device according to claim 4 , wherein said relatively high orders of a polynomial are relatively high even-numbered orders of the polynomial.
9 . The device according to claim 2 , wherein said cross section is selected from the group consisting of a hyperbolic cross section and a parabolic cross section.
10 . A method for manufacturing a device for homogenizing optical beams, the device having a boundary surface through which a beam to be homogenized can pass or at which the beam to be homogenized can be reflected, which comprises the steps of:
forming a body for homogenizing the optical beams, the body having the at least one optically functional boundary surface and a plurality of elements, selected from the group
consisting of lens elements and mirror elements, disposed on the at least one optically functional boundary surface;
determining a light distribution of light passing through an individual one of said lens elements of the plurality of elements or of light reflected by an individual one of the mirror elements of the plurality of elements; and
applying a structure being complementary to the light distribution determined to each of the elements.
11 . The method according to claim 10 , which further comprises forming the structure to have a larger amplitude in an edge region of the elements than in a central region of the elements.
12 . The method according to claim 10 , which further comprises producing the elements with a regular cross section.
13 . The method according to claim 10 , which further comprises producing the elements with a cross section selected from the group consisting of a second order spherical cross section and an aspherical cross section.