Laser package and projector with the laser package
View Patent ↗A laser device comprises a plurality of laser diodes, each laser diode emitting a light beam having a fast axis and a slow axis and a beam direction; and one or more optical components configured to modify a divergence of the light beams in a fast axis plane and/or in a slow axis plane such that the light beams have a same focal plane in the fast axis plane and in the slow axis plane.
1. A laser device, comprising:
a laser package comprising a plurality of laser diodes, each laser diode emitting a light beam having a fast axis and a slow axis and a beam direction, wherein the light beams of all laser diodes of the laser package are emitted from the laser package as a pattern; and
one or more optical components configured to modify a divergence of the light beams in a fast axis plane and/or in a slow axis plane such that the light beams have a same focal plane in the fast axis plane and in the slow axis plane,
wherein the laser diodes are mounted on one or more submounts,
wherein the one or more submounts are arranged vertically on a base,
wherein the one or more optical components comprise at least one cylindrical lens and a lens array,
wherein the at least one cylindrical lens is assigned to at least two laser diodes,
wherein the lens array comprises a plurality of convergent cylindrical microlenses arranged next to each other along a direction in the fast axis plane,
wherein for the pattern of the light beams emitted from the laser package a minimum aperture in the fast axis plane and a minimum aperture in the slow axis plane overlap,
wherein the minimum aperture in the fast axis plane denotes, along the fast axis, a minimum beam size of a superposition of the light beams of all laser diodes and the minimum aperture in the slow axis plane denotes, along the slow axis, a minimum beam size of a superposition of the light beams of all laser diodes, and
wherein, at an output surface of the lens array, the light beam of at least one laser diode is tilted in the fast axis plane with respect to the light beam of another of the laser diodes at the output surface of the lens array and/or with respect to an optical axis of the assigned microlens.
2. The laser device of claim 1 , wherein at least one optical component is directly placed on the one or more submounts.
3. The laser device of claim 2 , wherein the one or more submounts are arranged, along the vertical direction, between the base and the at least one optical component that is directly placed on the one or more submounts.
4. The laser device of claim 1 , wherein at least one optical component forms a window of the laser package.
5. The laser device of claim 1 , wherein the at least one cylindrical lens that is assigned to at least two laser diodes is a single cylindrical lens that is assigned to all laser diodes.
6. The laser device of claim 1 , wherein the one or more optical components comprise a convergent optical component influencing only a beam divergence in the fast axis plane.
7. The laser device of claim 1 ,
wherein each of the microlenses is assigned to at least one laser diode,
wherein each of the microlenses has a cylinder axis that is perpendicular to the fast axis and parallel to the slow axis.
8. The laser device of claim 1 , wherein at least some of the laser diodes are tilted with respect to each other in the fast axis plane.
9. The laser device of claim 1 , wherein at least one laser diode is arranged off-centered in the fast axis plane with respect to the optical axis of the assigned microlens.
10. The laser device of claim 1 , wherein the lens array comprises a plurality of microlenses that have different optical powers.
11. The laser device of claim 1 , wherein at least some of the laser diodes are tilted with respect to each other in the slow axis plane.
12. The laser device of claim 1 , wherein the one or more optical components comprise a divergent optical component influencing only a beam divergence in the slow axis plane.
13. The laser device of claim 1 , wherein the one or more optical components comprise a divergent cylindrical lens assigned to all laser diodes.
14. The laser device of claim 1 , wherein one or more of the plurality of laser diodes are tilted at an angle from an axis of symmetry of the one or more optical components.
15. The laser device of claim 1 , further comprising a prism having two reflecting sides, onto which the laser diodes emit light, wherein on each side there are several faces that are tilted with respect to each other.
16. The laser device of claim 1 ,
wherein at least two laser diodes emit light beams that are arranged next to each other in a direction in a first plane,
wherein the one or more optical components comprises a lens that is assigned to the at least two laser diodes and that has a curvature that lies is a second plane that is the same plane as the first plane.
17. The laser device of claim 16 , wherein the lens is a cylindrical lens having a cylinder axis, wherein the cylinder axis is perpendicular to the first plane.
18. A projector comprising a laser device and a scanning mirror,
wherein the laser device comprises:
a laser package comprising a plurality of laser diodes, each laser diode emitting a light beam having a fast axis and a slow axis and a beam direction, wherein the light beams of all laser diodes of the laser package are emitted from the laser package as a pattern of at least 2×2 light beams; and
one or more optical components configured to modify a divergence of the light beams in a fast axis plane and/or in a slow axis plane such that the light beams have a same focal plane in the fast axis plane and in the slow axis plane,
wherein the laser diodes are mounted on one or more submounts,
wherein the one or more submounts are arranged vertically on a base,
wherein the one or more optical components comprise at least one cylindrical lens and a lens array,
wherein the at least one cylindrical lens of the one or more optical components is assigned to all laser diodes of the laser device,
wherein the lens array comprises a plurality of cylindrical microlenses,
wherein for the pattern of the at least 2×2 light beams emitted from the laser package a minimum aperture in the fast axis plane and a minimum aperture in the slow axis plane overlap,
wherein the minimum aperture in the fast axis plane denotes, along the fast axis, a minimum beam size of a superposition of the light beams of all laser diodes and the minimum aperture in the slow axis plane denotes, along the slow axis, a minimum beam size of a superposition of the light beams of all laser diodes, and
wherein the scanning mirror is placed at the position of the overlapping apertures.
19. A laser device, comprising:
a laser package comprising a plurality of laser diodes, each laser diode emitting a light beam having a fast axis and a slow axis and a beam direction, wherein the light beams of all laser diodes of the laser package are emitted from the laser package as a pattern; and
one or more optical components configured to modify a divergence of the light beams in a fast axis plane and/or in a slow axis plane such that the light beams have a same focal plane in the fast axis plane and in the slow axis plane,
wherein the laser diodes are mounted on one or more submounts,
wherein the one or more submounts are arranged vertically on a base,
wherein the laser diodes and submounts are placed at different relative angles with respect to a central parallel prism,
wherein the one or more optical components comprise two cylindrical lenses or at least one cylindrical lens and a lens array,
wherein at least one cylindrical lens of the one or more optical components is assigned to at least two laser diodes,
wherein for the pattern of the light beams emitted from the laser package a minimum aperture in the fast axis plane and a minimum aperture in the slow axis plane overlap, and
wherein the minimum aperture in the fast axis plane denotes, along the fast axis, a minimum beam size of a superposition of the light beams of all laser diodes and the minimum aperture in the slow axis plane denotes, along the slow axis, a minimum beam size of a superposition of the light beams of all laser diodes.