A speckle-free three-primary-color laser light source and laser projection system
A technology of laser light source and three primary colors, which is applied in the field of projection display, can solve problems such as image blurring, achieve the effects of improving imaging quality, reducing laser speckle contrast, and significantly reducing speckle effect
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Embodiment 1
[0037] Such as figure 1 Shown is a basic embodiment of the speckle-free tri-color laser light source of the present invention.
[0038] It includes a red first laser module 1, a green second laser module 2 and a blue third laser module 3, which are used to emit lasers of three primary colors that meet brightness requirements.
[0039] The first red laser module 1, the second green laser module 2 and the third blue laser module 3 can be a single laser or a laser array composed of multiple lasers; the lasers can be semiconductor lasers, solid-state lasers or fiber lasers.
[0040] For laser arrays, trapezoidal mirrors can be used for beam shaping to compress the etendue, and then converged and coupled into optical fibers through lenses. Such as figure 2 The typical mode of the fiber-coupled laser module is shown. The laser array is composed of multiple identical lasers LD (for example, a 2×4 or 3×4 array structure). The mirror M1 compresses the beam aperture, and then couple...
Embodiment 2
[0046]The difference from Embodiment 1 is that the first laser module 1 is blue, the second laser module 2 and the third laser module 3 are red and green, and the surface a of the scattering sheet 7 is coated with a dichroic film to make the blue light When the laser light is incident, it is transmitted, and the red and green laser light is reflected, and the surface b of the scattering sheet 7 is also coated with an anti-reflection film.
Embodiment 3
[0048] Such as image 3 Shown is another basic embodiment of the speckle-free three-primary-color laser light source of the present invention. Including: first red laser module 1, second green laser module 2, third blue laser module 3, energy transmission fiber 4, collimating lens 21, converging lens 22, scattering sheet 23, motor shaft 24 and rectangular integrating rod 25.
[0049] The first red laser module 1 , the second green laser module 2 and the third blue laser module 3 are used to emit lasers of three primary colors that meet brightness requirements. The red, green and blue laser module can be a single laser or a laser array composed of multiple lasers. The laser can be a semiconductor laser, a solid state laser or a fiber laser. For laser arrays, trapezoidal mirrors can be used for beam shaping to compress the etendue, and then converged and coupled into optical fibers through lenses.
[0050] It also includes an energy transmission fiber 4, which uses a step-re...
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