Optoelectronic device

1. An optoelectronic device for projecting a first beam of coherent first electromagnetic radiation onto a surface and a second beam of coherent second electromagnetic radiation onto the surface, comprising:

a first radiation source adapted for emitting the first beam of coherent first electromagnetic radiation;

a first phase-modifying element in a beam path of the first electromagnetic radiation for modifying a phase of the first electromagnetic radiation in a subzone of the first beam;

a radiation-directing element in the beam path of the first electromagnetic radiation for changing a beam direction of the first beam;

a second radiation source adapted to emit a second beam of coherent second electromagnetic radiation;

an optical combiner adapted to superimpose the first beam on the second beam; and

a second phase-modifying element in the beam path of the second electromagnetic radiation for changing a phase of the second electromagnetic radiation in a subzone of the second beam.

2. The optoelectronic device according to claim 1 , wherein the first radiation source comprises a laser.

3. The optoelectronic device according to claim 1 , wherein the laser comprises a laser diode.

4. The optoelectronic device according to claim 1 , wherein the first beam emitted by the first radiation source is divergent.

5. The optoelectronic device according to claim 1 , wherein the first beam emitted by the first radiation source exhibits a divergence angle which is greater than or equal to 5 degrees and less than or equal to 20 degrees.

6. The optoelectronic device according to claim 1 , wherein the first phase-modifying element is arranged immediately downstream of the first radiation source in the beam path of the first electromagnetic radiation.

7. The optoelectronic device according to claim 1 , wherein the device additionally comprises a first optical element, and the first optical element is arranged downstream of the first phase-modifying element in the beam path of the first electromagnetic radiation.

8. The optoelectronic device according to claim 7 , wherein the first optical element is adapted to at least one of collimate and focus the first beam.

9. The optoelectronic device according to claim 7 , wherein the first optical element is at a distance greater than or equal to 0.5 mm and less than or equal to 5 mm from the first radiation source.

10. The optoelectronic device according to claim 7 , wherein the first phase-modifying element is at a distance from the first radiation source which amounts to less than half the distance between the first optical element and the first radiation source.

11. The optoelectronic device according to claim 1 , wherein the first phase-modifying element comprises at least a first zone and a second zone, which are configured to respectively modify the phase of the first electromagnetic radiation to a different degree.

12. The optoelectronic device according to claim 11 , wherein the first and second zones are such that modification of the phase of the first electromagnetic radiation is constant in an entirety of the first zone and modification of the phase of the first electromagnetic radiation is constant in an entirety of the second zone.

13. The optoelectronic device according to claim 11 , wherein the first and second zones are such that the phase of the first electromagnetic radiation is modified continuously transversely of the first beam direction.

14. The optoelectronic device according to claim 11 , wherein the first and second zones comprise optical path lengths for the first electromagnetic radiation which differ from one another at least in part.

15. The optoelectronic device according to claim 11 , wherein the first and second zones comprise holographic structures which differ from one another at least in part.

16. The optoelectronic device according to claim 1 , wherein a change in phase of the first electromagnetic radiation brought about by the first phase-modifying element is variable over time.

17. The optoelectronic device according to claim 16 , wherein the first phase-modifying element is configured to be moved transversely of the beam path of the first electromagnetic radiation.

18. The optoelectronic device according to claim 1 , wherein the radiation-directing element is configured to direct the first beam over the surface.

19. The optoelectronic device according to claim 1 , wherein the radiation-directing element comprises at least one directable mirror.

20. The optoelectronic device according to claim 1 , wherein the radiation-directing element is configured to cause the first beam to sweep a fixed solid angle zone periodically.

21. The optoelectronic device according to claim 1 , for the additional projection of a third beam of coherent third electromagnetic radiation onto the surface, further comprising:

a third radiation source adapted for emitting a third beam of coherent third electromagnetic radiation; and

an optical combiner configured to superimpose at least one of the first and the second beam on the third beam.

22. The optoelectronic device according to claim 21 , further comprising a third phase-modifying element in the beam path of the third electromagnetic radiation for changing a phase of the third electromagnetic radiation in a subzone of the third beam.

23. An optoelectronic device for projecting a first beam of coherent first electromagnetic radiation onto a surface, a second beam of coherent second electromagnetic radiation onto the surface, and a third beam of coherent third electromagnetic radiation onto the surface, comprising:

a first radiation source adapted to emit the first beam of coherent first electromagnetic radiation;

a first phase-modifying element in a beam path of the first electromagnetic radiation for modifying a phase of the first electromagnetic radiation in a subzone of the first beam;

a radiation-directing element in the beam path of the first electromagnetic radiation for changing a beam direction of the first beam;

a second radiation source adapted to emit the second beam of coherent second electromagnetic radiation;

an optical combiner adapted to superimpose the first beam on the second beam;

a third radiation source adapted to emit the third beam of coherent third electromagnetic radiation;

an optical combiner adapted to superimpose at least one of the first beam and the second beam on the third beam; and

a third phase-modifying element in the beam path of the third electromagnetic radiation for changing the phase of the third electromagnetic radiation in a subzone of the third beam.