Generation device of random polarization distributing vector light beam

A technology for generating devices and vectors, which is applied in optics, optical components, nonlinear optics, etc., can solve the problem of not being able to generate multiple arbitrary polarization distribution vector beams at the same time, achieve the effect of reducing the impact of beam quality and broad application prospects

Inactive Publication Date: 2008-05-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 p

Method used

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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

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Effect test

Embodiment 1

[0022] As shown in Figure 1, the core of the generating device of the arbitrary polarization distribution vector light beam according to the present invention is that a spatial light modulator 2, a first lens 3, a Filter 4, two quarter-wave plates 5, second lens 6 and phase-type Ronchi grating 7; spatial light modulator 2 is located at the front focal plane of first lens 3, and the rear focal plane of first lens 3 is set Filter 4; filter 4 is located at the front focal plane of the second lens 6 at the same time; phase-type Ronchi grating 7 is located at the back focal plane of the second lens 6; two quarter-wave plates 5 are close to the backlight of the filter 4 Set aside. As shown in Figure 2, the complete optimal technical scheme of the generating device of the arbitrary polarization distribution vector beam of the present invention is as follows: the laser we use is the green laser 8 with a wavelength of 532 nanometers of Coherent Company, and the spatial light modulator ...

Embodiment 2

[0026] The 4f optical system is built according to the principle in Figure 1, and the specific experimental system constructed on this basis is shown in Figure 2. Project the computational hologram (CGH) shown in the second column in Figure 3 onto the spatial light modulator, and the cylindrical symmetry vector corresponding to the polarization distribution shown in the first column in Figure 3 can be obtained at the CCD in Figure 2 beam. The beam intensities without linear polarizer 2 and with linear polarizer 2 inserted in front of the CCD are shown in columns 3 and 4 in Figure 3, and the dark spot in the center of the beam is caused by the singularity of the polarization state distribution uncertainty. When the linear polarizer 2 used as a polarizer is inserted in front of the CCD, an extinction direction will appear in the beam intensity distribution, and the extinction direction corresponds to π / 2- 0 . In the four experimental results, the extinction direction is in th...

Embodiment 3

[0028] The 4f optical system is built according to the principle in Figure 1, and the specific experimental system constructed on this basis is shown in Figure 2. By projecting the computational hologram shown in the second column of Fig. 4 on the spatial light modulator, the vector beam corresponding to the polarization distribution shown in the first column of Fig. 4 can be obtained at the CCD in Fig. 2 . 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. Meaning of the symbols in Figu...

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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 on a 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 is positioned 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 effect to 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 on 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, or 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 bette...

Claims

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Application Information

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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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