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Mechanical stress free multimode fiber beam speckle homogenization system

A multi-mode fiber, non-mechanical technology, applied in optics, optical components, instruments, etc., can solve the problems of complexity, limited improvement of spot uniformity, difficult to effectively promote, etc., and achieve the effect of uniform light intensity distribution of the spot.

Inactive Publication Date: 2017-05-24
NINGBO NAMAZE BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are also special processing schemes for multimode optical fibers, such as US Patent 6532244 to fuse fibers with different core sizes and numerical apertures, and Chinese Patent CN103439772 to perform high-temperature heat treatment on optical fibers to produce crystal particles. Such schemes are more complicated to implement and difficult to implement. effective promotion
If the uniformity of the spot is not required, there is also a plan to shape the spot by inserting a rough optical surface such as ground glass in the beam path, such as the optical window of the flashlight, but this method has limited improvement in the uniformity of the spot and is only suitable for low-end application

Method used

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  • Mechanical stress free multimode fiber beam speckle homogenization system
  • Mechanical stress free multimode fiber beam speckle homogenization system
  • Mechanical stress free multimode fiber beam speckle homogenization system

Examples

Experimental program
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Effect test

Embodiment 1

[0029] For a transmissive spatial light modulator, one can pass figure 1 The setup shown performs spot homogenization. The beam of the high-power semiconductor laser first generates a collimated beam of appropriate size through an optical beam expander or beam shrinker system, then adjusts the polarization direction through a half-wave plate, enters a transmission spatial light modulator for spatial mode modulation, and then passes through a fiber coupling system coupled to multimode fiber. figure 1 The optical beam expander or beam reducer system in is suitable for the case where the size of the laser beam spot does not match the size of the input surface of the spatial light modulator, and it is an optional part in practical applications. figure 1 The half-wave plate used to match the laser output polarization mode and the spatial light modulator uses the polarization mode, which is also an optional part.

Embodiment 2

[0031] For reflective spatial light modulators, the figure 2 and image 3 The setup shown performs spot homogenization. figure 2 and image 3 The main difference is how reflective spatial light modulators are used. figure 2Using a non-perpendicular angle of incidence, image 3 Use a normal angle of incidence. figure 2 and image 3 The choice of depends on the requirements of the reflective spatial light modulator. Since spot homogenization does not require high modulation depth and modulation accuracy, try to use figure 2 The light path structure shown is more convenient to realize.

[0032] figure 2 The beam of the medium and high power semiconductor laser firstly generates a collimated beam of appropriate size through an optical beam expander or beam shrinker system, then adjusts the polarization direction through a half-wave plate, is reflected by a mirror to a reflective spatial light modulator for spatial mode modulation, and then passes through The fiber c...

Embodiment 3

[0036] For embedded spatial light modulators, the Figure 4 The setup shown performs spot homogenization. The collimated beam (with collimating lens system) generated by the high-power semiconductor laser tube is modulated by the integrated spatial light modulator system and then coupled into the multimode fiber by the modular fiber coupling system. Optical base housings are used to mechanically secure and protect the above optical components. Since the spatial light modulator is integrated into the laser system, the whole system can directly obtain the uniform beam output from the multimode fiber, which is more convenient to use.

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Abstract

The invention belongs to the technical field of optics and provides a mechanical stress free multimode fiber beam speckle homogenization system. According to the system, light beams output by a laser sequentially enter a spatial light modulator through an incident angle of light of different modes in a lens group for modulating, and are coupled to multimode fibers through an optical fiber coupling system, and the light output by the multimode fibers is received by an image sensor. According to the system disclosed by the invention, the modes of input light are dynamically modulated and perturbed by the spatial light modulator, so that the distribution of the light spot and light intensity of the input light transmitted through the multimode fibers is uniform.

Description

technical field [0001] The technology of the invention relates to a mechanical stress-free multimode optical fiber beam spot homogenization scheme, which is suitable for optical fiber coupling, optical imaging and illumination of multimode lasers, especially for biological optical imaging systems, and belongs to the technical field of laser and optical fiber optics. [0002] technical background [0003] Semiconductor lasers are widely used in people's production, life and scientific research. Semiconductor lasers are widely welcomed by people for their cheapness, ease of use, stability and diversity of wavelength selection, and are gradually replacing other types of expensive lasers in conventional applications. Semiconductor lasers can be divided into two types: single-mode and multi-mode. The transverse mode characteristics of the output laser of the single-mode semiconductor laser are excellent, and it is very close to the fundamental transverse mode Gaussian beam (TEM00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09
CPCG02B27/0916G02B27/0927G02B27/0955G02B27/0977
Inventor 陈鹏
Owner NINGBO NAMAZE BIOTECH CO LTD
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