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Speckle suppression device based on frustrated total internal reflection light splitting

A technology of suppressed total internal reflection and suppression devices, applied in installation, optics, optical components, etc., can solve the problems of large system volume and complex optical path, and achieve the effects of small size, suppression of speckle, and destruction of laser coherence

Pending Publication Date: 2022-01-07
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By coating 50% reflective film for light splitting, although the number of light splitting can be increased and the intensity of the outgoing light can be the same, but there are many independent light splitting elements in these light splitting systems, which will lead to complex optical paths and large system volumes

Method used

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  • Speckle suppression device based on frustrated total internal reflection light splitting
  • Speckle suppression device based on frustrated total internal reflection light splitting
  • Speckle suppression device based on frustrated total internal reflection light splitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Next, how to realize incoherent light splitting with equal light intensity will be described in the case of K=3.

[0085] The first glass substrate 1 and the second glass substrate 5 are made of silica material, and the refractive index n of the silica material is i =1.45, the thickness of the second glass substrate 5 and the spacer 4 is h, and the adhesive layer 3 uses a material whose refractive index is similar to that of the first glass substrate 1 and the second glass substrate 5. Shadowless glue (uv glue) filling, the refractive index n of the shadowless glue (uv glue) uv =1.46≈n i .

[0086] The Dove prism 6 adopts a Dove prism whose left and right base angles are 75°, that is, α=75°, and the Dove prism 6 uses the same glass substrate 1 and the second glass substrate 5. The material, namely silica, has a refractive index n i = 1.45.

[0087] A bunch of wavelength λ=520nm, the s-polarized incident laser beam 7 that energy is 1 is incident perpendicular to the...

Embodiment 2

[0122] Parallel arrangement of J-beam one-dimensional array incident laser beams along the broadside of the speckle suppression device based on frustrated total internal reflection splitting, after passing through the speckle suppression device based on frustrated total internal reflection splitting A two-dimensional array of incoherent outgoing laser beams with the same light intensity can be obtained.

[0123] Wherein, the spectroscopic principle of each incident laser beam is the same as that in Embodiment 1. If the patterned nano film 2 is coated with the K layer of the MgF 2 , then J×(K+1) beams emitted from the array can be obtained to achieve the effect of beam expansion and splitting.

[0124] Combining two speckle suppression devices based on frustrated total internal reflection spectroscopy in a cascaded manner, the outgoing laser beam of the first device is used as the incident laser beam of the second device, and it can be obtained A two-dimensional array of inco...

Embodiment 3

[0126] Combining the two speckle suppression devices based on frustrated total internal reflection spectroscopy, that is, after setting up the first one of the speckle suppression devices based on frustrated total internal reflection spectroscopy, the second The long edge of the speckle suppression device based on frustrated total internal reflection spectroscopy is placed along the outgoing direction of the outgoing laser beam of the first group of speckle suppression devices based on frustrated total internal reflection spectroscopy, and The outgoing laser beam of the first said device is incident along the broadside of the second said device and perpendicular to the said Dove prism 6 of the second said device, i.e. the outgoing laser beam of the first said device The laser beam is used as the incident laser beam of the second device, and finally a two-dimensional array of incoherent outgoing laser beams with the same light intensity can be obtained to achieve the effect of b...

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Abstract

The invention provides a speckle suppression device based on frustrated total internal reflection light splitting. The speckle suppression device comprises a first glass substrate, a patterned nano film, a bonding layer, a spacer, a second glass substrate and a Dove prism. A beam of laser enters the speckle suppression device through the Dove prism, is transmitted for multiple times through the first glass substrate and the bonding layer and is totally reflected for multiple times through the second glass substrate, a frustrated total internal reflection phenomenon occurs on the patterned nano-film, and finally a group of incoherent emergent laser beams with the same light intensity are formed, and the purposes of destroying laser coherence and inhibiting speckles are achieved. Compared with the prior art, the speckle suppression device provided by the invention has the advantages of zero power consumption, static state, small size and the like.

Description

technical field [0001] The invention relates to the technical field of optical design, and more specifically, to a speckle suppression device based on frustrated total internal reflection spectroscopy. Background technique [0002] The laser has good monochromaticity. When a laser beam passes through a rough surface, the transmitted light will interfere due to the coherence of the laser, showing a light and dark laser speckle with uneven light intensity distribution. In order to avoid the problem of reducing image quality due to laser speckle, the speckle phenomenon must be suppressed. [0003] Based on this, those skilled in the art have found that the split laser beam has an effective suppression effect on the speckle phenomenon. [0004] At present, although there are some feasible spectroscopic systems and equipment, most of them are realized by coating 50% reflective film. By coating 50% reflective film for light splitting, although the number of light splits can be i...

Claims

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Application Information

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IPC IPC(8): G02B27/48G02B7/18
CPCG02B27/48G02B7/1805
Inventor 仝召民燕宇翔
Owner SHANXI UNIV
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