Optical pattern generators using axicon segments
View Patent ↗Optical pattern generators use rotating reflective axicon segments to produce images that can have different dimensions along the pattern direction compared to the cross pattern direction. Examples include both single axicon pattern generators and dual axicon pattern generators that independently control the image space relative aperture and thereby control the image dimensions in two orthogonal directions.
1. A single axicon optical pattern generator for generating a pattern of figures at a target location, comprising:
a rotating component having a plurality of reflective axicon segments, the axicon segments having at least two different included angles, the rotating component positioned so that the axicon segments rotate through an incident optical beam as the rotating component rotates about its rotation axis, each axicon segment deflecting the incident optical beam to generate a figure from the pattern of figures,
wherein each of the axicon segment is a surface of revolution that is rotationally symmetric about an axis of revolution.
2. The single axicon optical pattern generator of claim 1 further comprising:
a first anamorphic optical component that compresses the incident optical beam in the sagittal plane as imaged onto the axicon segments; and
a second anamorphic optical component that decompresses the optical beam in the sagittal plane after leaving the axicon segment, the rotating component optically positioned between the first and second anamorphic optical components.
3. The single axicon optical pattern generator of claim 2 wherein the first anamorphic optical component compresses the incident optical beam into a line focus at the axicon segments.
4. The single axicon optical pattern generator of claim 2 wherein the optical beam is collimated when entering the first anamorphic optical component, the first anamorphic optical component compresses the incident optical beam into a line focus at the axicon segments, and the second anamorphic optical component re-collimates the optical beam.
5. The single axicon optical pattern generator of claim 2 wherein the first anamorphic optical component comprises a first cylindrical optical component and the second anamorphic optical component comprises a second cylindrical optical component.
6. The single axicon optical pattern generator of claim 2 further comprising a non-anamorphic imaging lens optically positioned between the rotating component and the target location, to focus the optical beam into a spot at the target location.
7. The single axicon optical pattern generator of claim 2 wherein a relative optical power of the first and second anamorphic optical components is adjustable, thereby adjusting a ratio of the numerical apertures in the sagittal and meridional planes at the target location and also adjusting a ratio of the spot widths of the optical beam in the sagittal and meridional planes at the target location.
8. The single axicon optical pattern generator of claim 1 wherein the axicon segments are segments of right circular cone surfaces having a common axis of revolution.
9. The single axicon optical pattern generator of claim 1 wherein the axicon segments have small included angles.
10. The single axicon optical pattern generator of claim 1 wherein the axis of revolution for the axicon segments is coincident with the rotation axis of the rotating component.
11. The single axicon optical pattern generator of claim 1 wherein the axis of revolution for the axicon segments is not coincident with the rotation axis of the rotating component, but is parallel to and displaced from the rotation axis.
12. The single axicon optical pattern generator of claim 1 wherein the optical beam enters the optical pattern generator from a direction that lies in a common plane with the rotation axis but is not parallel to the rotation axis.
13. The single axicon optical pattern generator of claim 1 wherein the optical beam enters and exits the axicon segments from directions that lies in a common plane with the rotation axis.
14. The single axicon optical pattern generator of claim 1 wherein the optical beam enters and exits the axicon segments from directions that are skew to the rotation axis.
15. The single axicon optical pattern generator of claim 1 wherein the rotating component is positioned so that the axicon segments rotate through multiple incident optical beams as the rotating component rotates about its rotation axis, the different optical beams generating different figures in the pattern of figures.
16. The single axicon optical pattern generator of claim 15 wherein the multiple incident optical beams are presented in a sagittal plane normal to the rotation axis.