A Laser Speckle Dissipation Device Based on Wavelength Diversity

Abstract

The invention belongs to the technical field of laser display, and particularly relates to a laser scattering spot eliminating device based on wavelength diversity. The laser scattering spot eliminating device comprises a scattering sheet, a single-side mirror, a square dodging pipe and anti-reflection glass, wherein the incident end surface of the square dodging pipe is provided with the single-side mirror; the emergent end surface of the square dodging pipe is provided with the anti-reflection glass; the laser beam generated by the laser is scattered through the scattering sheet; scattering light generated by the scattering sheet is directly coupled into the square dodging pipe through the single-surface mirror; laser gain media and micrometer / nanometer scattering bodies are arranged in the square dodging pipe. The laser spot scattering inhibition scheme is designed according to the characteristics of a laser projection system; the good shaping uniform field can be obtained; the laser scattering spot can be effectively inhibited; the light energy utilization rate is improved; the size is small; the structure is simple; the cost is low; the consistency and the stability of the system are high.

Description

technical field [0001] The invention belongs to the technical field of laser display, and in particular relates to a laser speckle elimination device based on wavelength diversity. Background technique [0002] With its wide color gamut, high brightness, high color saturation, low energy consumption, and long life, laser is considered to be an ideal light source to replace traditional light sources (such as high-pressure mercury lamps or xenon lamps) in the field of information display. [0003] However, the laser light source is a highly coherent light, and its inherent spatial and temporal coherence makes it reflect or transmit through a rough surface (such as a screen), the optical path difference is caused by the height fluctuation of rough surface elements, resulting in limited The image received by the intensity detector of the aperture (such as the observer's eyes) has a granular pattern speckle, that is, laser speckle, and this phenomenon seriously affects the qualit...

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Problems solved by technology

However, according to the technical method described in the application, at room temperature, the same incident laser beam is filled with a liquid nanocomposite material (0.05ml of 2.5% PS pellets mixed with 10ml of deionized water) with a concentration of 0.0125%. The optical power of the speckle-dissipating device with a cross-section of 8.8mm×7mm and a length of 4.2cm and the empty optical tube device is tested, and the results are as follows Figure 1a , Figure 1b , Figure 1c As shown, the results show that the light loss of the speckle dissipation device is too large to meet the practical application of the laser projection system

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