Laser speckle-removing optical component, laser source and laser projection equipment
This disclosure provides a laser speckle-removing optical component, including a beam-shrinking lens group and a diffusion sheet arranged on a laser emergent optical path, where the beam-shrinking lens group includes a first beam-shrinking lens and a second beam-shrinking lens, and the diffusion sheet is located between the first beam-shrinking lens and the second beam-shrinking lens. The arrangement of the diffusion sheet between the first beam-shrinking lens and the second beam-shrinking lens, increases the area of speckles received by the diffusion sheet component, reduces energy density of the light received, and is able to alleviate the accumulation phenomenon of dust particles on the diffusion sheet, therefore, alleviating light attenuation phenomenon, and prolonging the service life of the laser source. This disclosure also provides a double-color laser source, a three-color laser source and a laser projection equipment applying the above laser speckle-removing optical component.
1. A double-color laser source, comprises at least a red laser device and a blue laser device, respectively emitting red laser and blue laser, wherein, the double-color laser source is provided with a beam-shrinking lens group and a diffusion sheet on at least one emergent optical path of an emergent optical path of the red laser and an emergent optical path of the blue laser, wherein the beam-shrinking lens group comprises a first beam-shrinking lens and a second beam-shrinking lens, and the diffusion sheet is located between the first beam-shrinking lens and the second beam-shrinking lens;
wherein, a fluorescent wheel is further arranged in the rear of the second beam-shrinking lens on the emergent optical path of the blue laser, and the fluorescent wheel is coated with green fluorescence powder, for emitting green fluorescence under excitation by the blue laser.
2. The double-color laser source according to claim 1 , wherein, the fluorescent wheel is provided with a non-transparent substrate on an opposite side of a laser incident side, and a light-converging component is further arranged in front of the laser incident side of the fluorescent wheel, for converging the red laser, green fluorescence reflected by the non-transparent substrate of the fluorescent wheel, and blue laser which is transmitted through the fluorescent wheel and returns.
3. The double-color laser source according to claim 2 , wherein, the light-converging component is a dichroscope, which is plated with a film capable of transmitting blue and red light while reflecting green light.
4. The double-color laser source according to claim 1 , wherein, a dichroic film is arranged on a surface of a laser incident side of the fluorescent wheel, for transmitting blue laser and reflecting green fluorescence, and a light-converging component is further arranged in front of an opposite side of the laser incident side of the fluorescent wheel, for converging the red laser, green fluorescence transmitted through the fluorescent wheel, and blue laser transmitted through the fluorescent wheel.
5. The double-color laser source according to claim 4 , wherein, the light-converging component is a dichroscope, which is plated with a film capable of transmitting red light while reflecting blue and green light.
6. The double-color laser source according to claim 1 , wherein, the diffusion sheet is capable of rotating under control.
7. The double-color laser source according to claim 1 , wherein, the diffusion sheet is capable of translating under control.
8. A laser projection equipment, comprising a display component, an optical module, a control component and a double-color laser source according to claim 1 , wherein, the optical module comprises a first optical component for guiding light from the double-color laser source towards the display component, and a second optical component for projecting light emergent from the display component to a screen, and the control component is configured to control the display component and the double-color laser source.