A laser light source and projection system

Abstract

The invention provides a laser light source and a projection system. The laser light source comprises at least two lasers and a speckle suppression device located on an emergent light path of the lasers. The at least two lasers comprise a first laser and a second laser, the first laser is used for emitting laser of a first color, and the second laser is used for emitting laser of a second color. The speckle suppression device is used for generating fluorescent light under the excitation of the laser of the first color and transmitting the laser of the second color, so that the fluorescent light and the laser of the second color are mixed and then emitted. Due to the fact that the spectrum of the fluorescence is the continuous spectrum, after the fluorescence is mixed with the laser of the second color, the spectrum of the laser of the second color can be broadened, and the mixed spectrum is allowed to be the continuous spectrum, so the coherence of the light source is reduced, speckles are weakened, and the picture display effect is improved.

Description

technical field [0001] The present invention relates to the field of laser technology, more specifically, to a laser light source and a projection system. Background technique [0002] In recent years, with the gradual mass production and cost reduction of semiconductor lasers, semiconductor lasers have been widely used in many fields such as cinema projection, home entertainment, and urban landscape lights. [0003] The principle of a semiconductor laser is that the excited energy level transition of the PN junction produces coherent light. These coherent lights are light beams with the same frequency and the same vibration direction, which will interfere in the area where they meet. For a projector, coherent light will also interfere during the optical transmission process of the projector. At the same time, the surface of the reflective surface is rough and uneven, which will also cause the inconsistency of the optical path of the light reaching the surface of the screen ...

AI Technical Summary

Problems solved by technology

[0004] In order to reduce speckle, it is usually necessary to use multiple wavelengths of the light source. At present, semiconductor lasers with multiple wavelengths are mainly used in combination. For example, when two lasers of the same color and different wavelengths are used in combination, speckle can be suppressed to a certain extent, but , which is fundamentally still a plurality of single-wavelength lasers, which will still produce interference phenomena, resulting in poor speckle suppression effect

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