Optical arrangement for converting an incident light beam, method for converting a light beam to a line focus, and optical device therefor

摘要

In a method for converting a light beam to a line focus, wherein the line focus extends according to its length along a first direction (y) and is narrow in a second direction (x) perpendicular to the first direction (y), the light beam is directed onto at least one conical optically operative surface, by which it is converted to the line focus. The light beam is directed onto the at least one optically operative surface with a ring-segment-shaped cross section transversely with respect to the light propagation direction. A device, in particular for carrying out the method, and an optical arrangement for generating a light beam with a ring-segment-shaped cross section are likewise described. In accordance with a further method and a further device, a line focus is generated only with spherical and/or cylindrical elements.

主权项

1. An optical arrangement, comprising:
a first optical element having a first optically operative surface having a top with a first top circumference, a circular bottom with a first bottom circumference which is greater than the first top circumference, and sides extending from the first top circumference to the first bottom circumference; and a second optical element having a second optically operative surface having a top with a second top circumference, a circular bottom with a second bottom circumference which is greater than the second top circumference, and sides extending from the second top circumference to the second bottom circumference, wherein:
the first and second optically operative surfaces define an axis of symmetry; andduring use of the arrangement:
a light beam is incident successively on the first optically operative surface and the second optically operative surface;the light beam is incident on the first and second optically operative surfaces off-axis with respect to the axis of symmetry such that the light beam is not incident at an intersection of the axis of symmetry with the first optically operative surface and such that the light beam is not incident at an intersection of the axis of symmetry with the second optically operative surface;a first light ray of the light beam is incident on the first optically operative surface at a first distance from the axis of symmetry;the first light ray of the light beam is incident on the second optically operative surface at a second distance from the axis of symmetry;the first distance is less than the second distance; andwhen the light beam has a non-ring-segment-shaped cross section which is transverse with respect to a propagation direction of the light beam when incident on the first optically operative surface, the light beam has a ring-segment-shaped cross section which is transverse with respect to a light propagation direction of the light beam when it emerges from the second optical element, the ring-segment-shaped cross section being an incomplete ring.