Generation device of random polarization distributing vector light beam

A generation device, a technology of linearly polarized light, applied in optics, optical components, nonlinear optics, etc., can solve the problem of not being able to generate a variety of arbitrary polarization distribution vector beams at the same time, to reduce the impact of beam quality, and to achieve broad application prospects. Effect

Inactive Publication Date: 2010-02-24
NANJING UNIV
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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiency that the existing technology cannot simultaneously generate multiple arbitrary polarization distribution vector beams in the same optical path, the present invention provides a vector beam that can obtain arbitrary polarization state distribution and coexistence of multiple polarization modes in the same optical path Generating device for arbitrary polarization distribution vector beam output by beam

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  • Generation device of random polarization distributing vector light beam
  • Generation device of random polarization distributing vector light beam
  • Generation device of random polarization distributing vector light beam

Examples

Experimental program
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Embodiment 1

[0022] Such as figure 1 As shown, the core of the device for generating a vector beam with arbitrary polarization distribution according to the present invention is that a spatial light modulator 2, a first lens 3, and a filter 4 controlled by a computer are sequentially arranged along the light direction of the light source 1 that generates polarized light. , two quarter-wave plates 5, a second lens 6 and a phase-type Ronchi grating 7; the spatial light modulator 2 is located on the front focal plane of the first lens 3, and the filter 4 is set on the back focal plane of the first lens 3 The filter 4 is also located on the front focal plane of the second lens 6; the phase Ronchi grating 7 is located on the back focal plane of the second lens 6; two quarter-wave plates 5 are placed close to the backlight side of the filter 4. Such as figure 2 As shown, the complete optimal technical scheme of the generating device of the arbitrary polarization distribution vector light beam ...

Embodiment 2

[0026] according to figure 1 The 4f optical system is built according to the principle, and the specific experimental system constructed based on this is as follows: figure 2 shown. Will image 3 The computational hologram (CGH) shown in column 2 in figure 2 in the CCD is obtained with the image 3 A cylindrically symmetric vector beam corresponding to the polarization distribution shown in the first column of . The beam intensities without linear polarizer 2 and with linear polarizer 2 inserted in front of the CCD are as follows image 3 As shown in columns 3 and 4 of , the dark spot at the center of the beam is caused by the singularity of the polarization state distribution uncertainty. When the linear polarizer 2 used as an analyzer is inserted in front of the CCD, there will be an extinction direction in the beam intensity distribution, and the extinction direction corresponds to In the four experimental results, the extinction direction is in the vertical direct...

Embodiment 3

[0028] according to figure 1 The 4f optical system is built according to the principle, and the specific experimental system constructed based on this is as follows: figure 2 shown. Will Figure 4 The computational hologram shown in column 2 in figure 2 The CCD is obtained with the Figure 4 The vector beam corresponding to the polarization distribution shown in the first column. The difference in the polarization state between the inner and outer modes leads to the appearance of a dark band at the boundary in the field intensity distribution, and the dark band gradually becomes clear with the increase of the polarization state difference between the inner and outer modes. Xiangshida's dark band is the clearest. Similar to Example 1, there is also the central singularity and the extinction direction after adding a linear polarizer. Here, the generation of m=1 dual-mode vector beams is realized by using our 4f system. Figure 4 Meaning of the symbols in: The experiment...

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Abstract

The invention provides a generation device of an arbitrary polarization distribution vector light beam, and is in turns provided with a spatial light modulator controlled by a computer, a first lens,a wave filter, two quarter wave plates, a second lens and a Rochi grating along the light direction of the light source producing linearly polarized light. The spatial light modulator is positioned ona front focal plane of the first lens, a back focal plane is provided with the wave filter, and the wave filter is synchronously positioned on a front focal plane of the second lens. Rochi grating ispositioned on a back focal plane of the second lens. Two quarter wave plates are placed by closely depending on the backlight source surface of the wave filter. The invention has the advantage of producing arbitrary vector light beam, and to be important, the device of the invention can produce the vector light beam in real time and dynamic manner. Moreover, the device greatly reduces the effectto the light beam quality caused by coherent noise, and can produce the high-quality vector light beam, and the producing manner is real time and dynamic.

Description

technical field [0001] The invention relates to a generating device for a vector beam, in particular to a dynamic and real-time generating device for a vector beam with arbitrary polarization distribution. Background technique [0002] Light waves contain information such as frequency, phase, intensity, and polarization. The light beams we use for scientific research are usually unpolarized light or polarized light in the form of linear polarization, circular polarization, and elliptical polarization. The polarization characteristics of these beams are relatively simple, and their polarization distribution is uniform in the plane perpendicular to the beam propagation direction, which is called a uniformly polarized beam. In general, the scalar beam model can be used to analyze and describe its propagation process. When dealing with problems related to these beams, we generally use scalar theory, so such beams can be collectively referred to as scalar beams. In order to make...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G02F1/01
Inventor 丁剑平汪喜林陈璟樊亚仙王慧田
Owner NANJING UNIV
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