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 diaphragm ( 100 ) and a ¼ wave plate group sequentially arranged on a laser beam optical path, the ¼ wave plate group comprising a first ¼ wave plate ( 200 ) and a second ¼ wave plate ( 300 ) having optical axis angles of 75°-105°, adjacent sides of the first ¼ wave plate ( 200 ) and the second ¼ wave plate ( 300 ) being closely arranged, the first ¼ wave plate ( 200 ) being arranged so as to allow a portion of an incident laser beam to pass through, the second ¼ wave plate ( 300 ) being arranged so as to allow 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.
1. A speckle elimination apparatus, comprising a diaphragm and a ¼ wave plate group sequentially arranged on a laser beam optical path,
wherein the ¼ wave plate group comprises a first ¼ wave plate and a second ¼ wave plate, wherein an optical axis of the first ¼ wave plate and an optical axis of the second ¼ wave plate form an included angle of 75°-105°, adjacent sides of the first ¼ wave plate and the second ¼ wave plate are closely arranged, the first ¼ wave plate is arranged to allow a portion of an incident laser beam to pass through, the second ¼ wave plate is arranged to allow a remainder of the incident laser beam to pass through, the portion of the incident laser beam occupies 25%-75% of the incident laser beam, and the diaphragm is attached to the ¼ wave plate group in a direction orthogonal to a direction of the laser beam optical path.
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 included angle between the optical axis of the first ¼ wave plate and the optical axis of the second ¼ wave plate is 90°.
4. The speckle elimination apparatus according to claim 1 , wherein the adjacent sides of the first ¼ wave plate and the second ¼ wave plate are fixedly bonded to each other.
5. The speckle elimination apparatus according to claim 1 , wherein the first ¼ wave plate and the second ¼ wave plate are rectangular-shaped, semicircular-shaped, or semioval-shaped ¼ wave plates respectively.
6. The speckle elimination apparatus according to claim 1 , wherein the first ¼ wave plate is an annular ¼ wave plate having a central opening, and the second ¼ wave plate is a ¼ wave plate that matches a shape of the opening.
7. The speckle elimination apparatus according to claim 6 , wherein the first ¼ wave plate is an annular ¼ wave plate having a central opening of a centrosymmetric shape, the annular ¼ wave plate is concentrically arranged with a light through hole of the diaphragm.
8. The speckle elimination apparatus according to claim 7 , wherein the first ¼ wave plate is an annular ¼ 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 .