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Illuminating system for eliminate speckle

A lighting system and speckle technology, which is applied in the field of laser lighting, can solve the problems of insufficient speckle elimination effect, low efficiency, and high cost, and achieve the effect of eliminating speckle effect, high efficiency, and low cost

Inactive Publication Date: 2007-10-31
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of micro-optical elements or random phase plates has disadvantages such as complex manufacturing process, large interface size, and high cost, and requires high-frequency motors to drive, and the effect of eliminating speckle is not ideal.
In addition, methods such as vibrating screens, holographic diffusion, and various complex optical systems have been used, but these methods are expensive, complex in structure, and the effect of eliminating speckle is not good enough
[0004] More importantly, the laser light source used in large-screen laser display projection systems is mainly a high-power single laser, which has the disadvantages of large size, high cost, low efficiency, unstable performance, and difficult maintenance, which restricts laser display technology. A big hurdle to the big screen
[0005] Therefore, in view of the deficiencies of the existing technology, people hope to obtain high-power laser output while eliminating the speckle effect, overcome the shortage of a single high-power laser, and realize large-screen laser projection display

Method used

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  • Illuminating system for eliminate speckle
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  • Illuminating system for eliminate speckle

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Embodiment 1

[0029] Here, an embodiment is used to describe the application of the present invention to a monochrome lighting system. Referring to Fig. 1, make an illumination system for eliminating speckle by optical fiber coupling of array lasers of the present invention, including n monochromatic lasers L 1 , L 2 、…L n , n=19 in this embodiment, the laser is a semiconductor laser with a wavelength of 635nm, and the power is from 100mW to watt level. Corresponding to the front end of each laser, a collimating lens and a converging lens are placed perpendicular to the laser emission direction to collimate and focus the beam. The selection of the focal length and aperture of the collimating lens and converging lens depends on the parameters of the laser. Proper selection of focal length and aperture is within the competence of those skilled in the art. After the beam is focused by the converging lens, it is coupled into the input end face of the output fiber. As shown in Figure 1, plac...

Embodiment 2

[0034] Here, an embodiment is used to illustrate the application of the present invention to a color lighting system. As shown in FIG. 4 , an embodiment of white field illumination for eliminating speckle by the array laser fiber coupling structure of the present invention is made. n sets of lasers are composed of R (red), G (green), B (blue) three primary colors or multi-primary color lasers. In this embodiment, lasers with R (red), G (green) and B (blue) three primary colors are used. The number of three primary color lasers is determined by the power ratio of a single laser and the visual white balance power, which is competent for those skilled in the art. In this embodiment n=19.

Embodiment n

[0035] Others are the same as embodiment 1. Corresponding to the front end of each laser, place an appropriate focal length and aperture collimating lens and converging lens in the direction of laser emission to make the beam collimate and focus the beam, and the beam is focused and coupled to the input end face of the output fiber; each laser beam passes through the fiber multiple times Reflecting mixed light, n optical fibers that output R, G, and B three-color lasers are arranged in a certain order and bundled into a single optical fiber form, as shown in Figure 5. The principle of optical fiber arrangement follows the principle of uniform color mixing.

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Abstract

The invention discloses a lighting system that eliminates the speckle by a laser array fiber-optical coupling structure, comprising a plurality of lasers emitting laser beam, the front of light outlet of which is provided with an alignment element and a convergence element in the vertical direction of emitted light, a beam collector, the inlet of which is optically connected with light outlet of each convergence element to collect the beams of all the lasers, a uniform field shaping device optically connected with the outlet of the beam collector for the uniform field of the laser emitted by the lasers. The invention can eliminate the speckle effect caused by the laser interference and satisfy the lighting demand of high light and degree of uniformity with small bulk, low cost, high efficiency, stable property and easy maintenance, and is applicable to the displaying apparatus with light source of laser like laser front projection and laser rear projection.

Description

technical field [0001] The invention relates to laser illumination, in particular to an illumination system for eliminating speckle with a laser array fiber coupling structure. Background technique [0002] As a light source with high brightness, good monochromaticity and good directionality, laser is more and more widely used. The display system using laser as the light source has the advantages of high saturation and wide color gamut. It is a new generation of display technology and plays an important role in improving the quality of display images and the efficiency of display systems. However, due to the high coherence of laser light, this display system is prone to speckle effects. Speckle is caused by the interaction of coherent waves scattered from a diffuse reflective surface. This speckle effect is an important cause of image resolution and image quality degradation. [0003] At present, the technology to eliminate laser speckle mainly uses phase modulation eleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V13/00F21V8/00F21V5/00
Inventor 毕勇许祖彦房涛王斌郑光亓岩成华
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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