Arrangement and apparatus for optical beam transformation

• US 20050105189A1
• Filed: 10/29/2004
• Published: 05/19/2005
• Est. Priority Date: 10/30/2003
• Status: Active Grant

• Current Assignee: LIMO Patentverwaltung GmbH & Co. KG
• Original Assignee: Hentze-Lissotschenko Patentverwaltungs GmbH & Co. KG.
• Inventors: Mikhailov, Aleksei
• Granted Patent: US 7,027,228 B2
• Time in Patent Office: Days
• US Class Current: 359/641
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 27/09 Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for adapting the beam shape of a laser diode G02B19/0052; adapting the beam shape of an LED G02B19/0061; coupling into light guides using intermediate optical elements G02B6/4204; beam shaping specially adapted for lasers H01S3/005
• CPC Class Codes: G02B 27/0961 Lens arrays lens arrays per se G02B3/0006
• CPC Class Codes: G02B 27/0966 Cylindrical lenses cylindrical lenses per se G02B3/06
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: H01S 5/4012 Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
• CPC Class Codes: H01S 5/4025 Array arrangements, e.g. constituted by discrete laser diodes or laser bar H01S5/42 takes precedence

Abstract

An arrangement for optical beam transformation, having at least one light source which can emit at least one light beam, with the at least one light beam having a greater divergence in a first direction (Y) than in a second direction (X) at right angles to it, a collimation means, which can at least reduce the divergence of the at least one light beam in the first direction (Y), an apparatus for optical beam transformation, which is arranged downstream from the collimation means in the propagation direction (Z) of the at least one light beam, with the apparatus being such that the divergence of the at least one light beam passing through the apparatus in the first direction (Y) is interchanged with the divergence in the second direction (X) at right angles to it, and such that the cross-sectional area of the at least one light beam is reduced in the apparatus for optical beam transformation.

Claims

1. An arrangement for optical beam transformation, comprising:

at least one light source which can emit at least one light beam, with the at least one light beam having a greater divergence in a first direction (Y) than in a second direction (X) at right angles to it;

a collimation means, which can at least reduce the divergence of the at least one light beam in the first direction (Y);

an apparatus for optical beam transformation, which is arranged downstream from the collimation means in the propagation direction (Z) of the at least one light beam, with the apparatus such that the divergence of the at least one light beam passing through the apparatus in the first direction (Y) is interchanged with the divergence in the second direction (X) at right angles to it;

wherein the apparatus for optical beam transformation is such that the cross-sectional area of the at least one light beam is reduced in the apparatus for optical beam transformation.

2. The arrangement for optical beam transformation as claimed in claim 1, wherein the arrangement produces an image of the at least one light beam to be transformed by it with respect to two directions (X′

, Y′

), which are at right angles to one another and to the propagation direction (Z) of the light beam, on a plane.

3. The arrangement as claimed in claim 2, wherein the plane on which the image of the light beam to be transformed can be produced is a plane at right angles to the propagation direction (Z).

4. The arrangement as claimed in claim 1, wherein the arrangement comprises collimation means and/or focusing means for collimation and/or focusing of the at least one light beam downstream from the apparatus for optical beam transformation, in the propagation direction (Z) of the at least one light beam.

5. The arrangement as claimed in claim 1, wherein the at least one light source is in the form of a semiconductor laser apparatus, in particular a semiconductor laser diode bar.

6. The apparatus for optical beam transformation for use in an arrangement as claimed in claim 1, comprising at least one inlet surface and at least one outlet surface, with the apparatus such that the divergence of a light beam passing through the apparatus in the first direction (Y) is interchanged with the divergence in the second direction (X) which is at right angles to it, wherein the apparatus for optical beam transformation is designed such that the cross-sectional area of the at least one light beam is reduced in the apparatus for optical beam transformation.

7. The apparatus as claimed in claim 6, wherein the apparatus for optical beam transformation is such that an image of the at least one light beam to be transformed by it can be produced with respect to two directions (X′

, Y′

), which are at right angles to one another and to the propagation direction (Z) of the light beam, on a plane.

8. The apparatus as claimed in claim 7, wherein the plane on which the image of the light beam to be transformed can be produced is a plane at right angles to the propagation direction (Z).

9. The apparatus as claimed in claim 6, wherein two or more cylindrical lenses are arranged on the at least one inlet surface and/or on the at least one outlet surface of the apparatus.

10. The apparatus as claimed in claim 9, wherein the two or more cylindrical lenses include an angle (α

) of +45° and

/or −

45°

with the second direction (X).

11. The apparatus as claimed in claim 9, wherein the at least one inlet surface and/or the at least one outlet surface of the apparatus has an essentially elongated, rectangular shape, with the longitudinal direction of the inlet surface and/or outlet surface corresponding essentially to the second direction (X).

12. The apparatus as claimed in claim 6, wherein the apparatus comprises two parts, which each have an inlet surface and an outlet surface.

13. The apparatus as claimed in claim 12, wherein two or more cylindrical lenses are arranged on each of the inlet and outlet surfaces of the parts.

14. The apparatus as claimed in claim 12, wherein the cylindrical lenses on two surfaces of the parts are aligned at right angles to the cylindrical lenses on two other surfaces of the parts.

15. The apparatus as claimed in claim 6, wherein at least one of the inlet and/or outlet surfaces of the apparatus is provided with two or more concave cylindrical lenses.

16. The apparatus as claimed in claim 12, wherein focal lengths of the cylindrical lenses on their inlet and/or outlet surfaces are different for at least one of the parts.

17. The apparatus as claimed in claim 16, wherein the focal lengths of the cylindrical lenses of at least one of the parts is an integer multiple of the focal length (f₁, f₂, f₃, f₄) of the respective other cylindrical lenses of the corresponding part.