Speckle elimination apparatus, laser light source and laser projection system
A speckle elimination apparatus, a laser light source and a laser projection system, the speckle elimination apparatus comprising a wave plate ( 100 ) and a transmission plate ( 200 ) respectively arranged on a laser beam light path, the wave plate ( 100 ) and the transmission plate ( 200 ) having similar refractive indices and closely arranged adjacent sides, the wave plate ( 100 ) being arranged so that an incident surface allows a portion of an incident laser beam to pass through, the transmission plate ( 200 ) being arranged so that an incident surface allows the remainder of the incident laser beam to pass through, the portion of the incident laser beam being 25%-75% of the incident laser beam. The speckle elimination apparatus eliminates the phenomenon of laser speckle, and prevents stray light from being produced during laser speckle elimination.
1. A speckle elimination apparatus, comprising:
a wave plate and a transmission plate respectively on a laser beam optical path, wherein
refractive indexes of the wave plate and the transmission plate are within a predetermined value such that a direction of a laser beam emerging from the wave plate is same as a direction of a portion of the laser beam that does not pass through an incident surface of the wave plate and adjacent sides thereof in a direction orthogonal to a direction of the laser beam optical path are attached to each other,
the wave plate is arranged to allow a portion of an incident laser beam to pass through an incident surface thereof,
the transmission plate is arranged to allow a remainder of the incident laser beam to pass through an incident surface thereof, and
the portion of the incident laser beam occupies 25%-75% of the incident laser beam.
2. The speckle elimination apparatus according to claim 1 , wherein the portion of the incident laser beam occupies 50% of the incident laser beam.
3. The speckle elimination apparatus according to claim 1 , wherein the wave plate is a half-wave plate.
4. The speckle elimination apparatus according to claim 1 , wherein the adjacent sides of the wave plate and the transmission plate are fixedly bonded to each other.
5. The speckle elimination apparatus according to claim 1 , wherein the wave plate is a rectangular-shaped, semicircular-shaped, or semioval shaped wave plate, and correspondingly, the transmission plate is a rectangular-shaped, semicircular-shaped, or semioval-shaped transmission plate.
6. The speckle elimination apparatus according to claim 1 , wherein the wave plate is an annular wave plate having a central opening, and the transmission plate is a transmission plate that matches a shape of the opening.
7. The speckle elimination apparatus according to claim 6 , wherein the wave plate is an annular wave plate having a central opening of a centrosymmetric shape.
8. The speckle elimination apparatus according to claim 7 , wherein the wave plate is an annular wave plate having a central circular opening.
9. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 1 .
10. A laser projection system, comprising the laser light source according to claim 9 .
11. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 2 .
12. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 3 .
13. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 4 .
14. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 5 .
15. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 6 .
16. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 7 .
17. A laser light source, comprising a laser device for emitting a laser beam, and further comprising the speckle elimination apparatus according to claim 8 .