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Chaos-modulated speckle-free laser projector

A laser projector and chaotic modulation technology, applied in the field of laser light source, can solve the problems of low speckle suppression efficiency and complex system

Active Publication Date: 2021-05-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing laser projection speckle suppression system is complicated and the speckle suppression efficiency is not high, the present invention provides a laser projector with chaotic modulation and no speckle

Method used

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  • Chaos-modulated speckle-free laser projector

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Embodiment 1

[0018] In this embodiment, the preferred scheme is adopted: as figure 1 As shown, several groups of laser arrays include a group of green laser arrays 5, a group of blue laser arrays 11, and a group of red laser arrays 12; the chaotic electrical signal generating device 1 is a chaotic circuit. In this embodiment, a Colpitts circuit is used, and a converging lens 6 is a high-curvature uniform converging lens, and the color-combining component 8 is a color-combining prism.

[0019] The specific operation of this embodiment is: the chaotic electrical signal generating device 1, that is, the Colpitts circuit, generates the chaotic electrical signal, inputs it into the broadband amplifier 2, amplifies the chaotic electrical signal, and inputs it into the biaser 4, and the driving voltage of the laser drive circuit 3 is also inputted into the biaser 4. After the two are mixed, the green laser array 5, the blue laser array 11 and the red laser array 12 are driven to emit light throug...

Embodiment 2

[0021] In this embodiment, the preferred scheme is adopted: as figure 2As shown, several groups of laser arrays include a group of green laser arrays 5, a group of blue laser arrays 11 and a group of red laser arrays 12; the chaotic electrical signal generating device 1 is a broadband chaotic light source 101 and a high-speed photodetector 102, the The output end of the broadband chaotic light source 101 is connected with the input end of the high-speed photodetector 102, and the output end of the high-speed photodetector 102 is connected with the input end of the broadband amplifier 2, and the converging lens 6 is a high-curvature uniform converging lens, a color combining component 8 is a color combining prism.

[0022] The specific operation of this embodiment is as follows: the chaotic electrical signal generator 1, that is, the broadband chaotic light source 101, sends out a light source signal, inputs it into the high-speed photodetector 102, and after generating the br...

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Abstract

The invention discloses a chaotic modulation speckle-free laser projector, which includes several groups of laser arrays, laser array driving devices, laser output parts and projection units, each group of laser arrays is composed of a plurality of same-color lasers; each group of laser arrays is followed by There are respective converging lenses and collimating lenses arranged along the respective optical paths, and laser output parts and projection units are arranged behind all the collimating lenses; the laser array driving device includes a chaotic electric signal generating device and a laser driving circuit, and the chaotic electric signal The output end of the generating device is connected to the input end of the broadband amplifier, the output of the broadband amplifier is to the bias device, the output of the laser driving circuit is to the bias device, and the bias device drives each group of multiple laser arrays through a line with a delay greater than 0.3 ns or greater than 6 cm. A laser glows. The invention ensures the full power output of the laser, not only suppresses the speckles of the laser, but also makes the projection effect of the projector better.

Description

technical field [0001] The invention relates to the field of laser light sources, in particular to a chaotic modulation speckle-free laser projector. Background technique [0002] With its high power, long life, and high degree of color reproduction, the three-color laser has attracted more and more attention, and has become the preferred light source for the next generation of projection display. At present, laser projectors use red, green and blue laser semiconductor (LD) arrays, which enter the projection unit through optical fibers or coupling lens systems to form a laser projection system. Due to its good coherence, the semiconductor laser will have strong speckle phenomenon on the projection screen, so it cannot be directly used as a projection light source. The current measures are to use elements such as phase plates or scattering plates to disturb its polarization state and phase, and reduce its coherence. These measures can only reduce the granularity and thicknes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/48G03B21/20
CPCG02B27/48G03B21/2013G03B21/208
Inventor 赵彤贺培鑫韩红贾志伟韩国华郭园园
Owner TAIYUAN UNIV OF TECH
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