Device for generating multiple collimated light beams
A device for generating multiple collimated light beams includes a carrier and at least two light generation units mounted on the carrier. The light generation units are configured to emit, each from an aperture, light beams at respectively different wavelengths and being arranged, with respect to axes of the light beams, substantially parallel and substantially in a common plane. A first lens is mounted on the carrier intersectingly to the axes of the light beams and has a principal plane. The light generation units have their apertures aligned along an alignment line substantially perpendicular to the axes of the light beams and the principal plane of the first lens is non-perpendicular to the axes of the light beams and is non-parallel to the alignment line.
1. A device for generating multiple collimated light beams, comprising:
a carrier;
at least two light generation units mounted on the carrier, the light generation units being configured to emit, each from an aperture, light beams at respectively different wavelengths and being arranged, with respect to axes of the light beams, substantially parallel and substantially in a common plane; and
a first lens mounted on the carrier intersectingly to the axes of the light beams and having a principal plane, the first lens being a fast axis collimation lens or a slow axis collimation lens;
wherein the light generation units have their apertures aligned along an alignment line substantially perpendicular to the axes of the light beams; and
wherein said principal plane of the first lens is non-perpendicular to the axes of the light beams and is non-parallel to the alignment line.
2. The device according to claim 1 , wherein the apertures are spaced at unequal distances from each other along the alignment line.
3. The device according to claim 1 , wherein there are three light generation units mounted on the carrier, configured to emit a green, a red and a blue light beam.
4. The device according to claim 1 , wherein the light generation units are mounted on the carrier via a submount.
5. The device according to claim 4 , wherein the alignment line lies parallel to an edge of the submount.
6. The device according to claim 1 , wherein the light generation units each comprise a laser diode.
7. The device according to claim 1 , wherein the first lens is made out of a material having a graded refraction index.
8. The device according to claim 1 , wherein the first lens is a rod lens having a constant profile along a longitudinal direction of the lens.
9. The device according to claim 1 , wherein the first lens has a planar side and at least two parallel cylindrical bulges on an opposite side thereof.
10. The device according to claim 8 , wherein a second lens, having a planar side and at least two cylindrical bulges on an opposite side thereof, is mounted before or after the first lens on the carrier when seen in the propagation direction of the light beams.
11. The device according to claim 9 , wherein a second lens, being an acylindrical rod lens, is mounted before or after the first lens on the carrier when seen in the propagation direction of the light beams.
12. The device according to claim 10 , wherein the second lens has a principal plane which is non-perpendicular to the axes of the light beams and is non-parallel to the alignment line.
13. The device according to claim 12 , wherein the principal plane of the first lens lies at a different angle to the alignment line than the principal plane of the second lens.
14. The device according to claim 10 , wherein a planar side of the first lens is joined to the planar side of the second lens.
15. The device according to claim 10 , wherein there is a transparent wedge joining a planar side of the first lens and the planar side of the second lens.
16. The device according to claim 11 , wherein there is a transparent wedge joining a planar side of the first lens and a planar side of the second lens.
17. The device according to claim 5 , wherein the alignment line lies on the edge of the submount.
18. The device according to claim 8 , wherein the first lens is an acylindrical rod lens.
19. The device according to claim 9 , wherein the first lens has three parallel cylindrical bulges.
20. The device according to claim 10 , wherein the second lens has three cylindrical bulges.
21. The device according to claim 14 , wherein the planar side of the first lens is monolithically joined to the planar side of the second lens.
22. The device according to claim 15 , wherein the transparent wedge monolithically joins the planar side of the first lens and the planar side of the second lens.
23. The device according to claim 16 , wherein the transparent wedge monolithically joins the planar side of the first lens and the planar side of the second lens.