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Device and method for generating column vector beams

A columnar vector and beam technology, which is applied in the field of devices for generating columnar vector beams, can solve problems such as complex molds, high precision requirements for intermediate filter lines, troublesome changes in lasers, etc.

Inactive Publication Date: 2010-08-04
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

However, to preserve TEM 10 (or TEM 01 ) mode beam while suppressing other order modes is more complex, and changing the laser resonator is also troublesome. For example, a ring with a line passing through the center of the circle can be designed, which can theoretically achieve a better output TEM 10 (or TEM 01 ) mode beam, but the accuracy of the intermediate filter line is very high, so it is difficult to achieve in reality

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  • Device and method for generating column vector beams
  • Device and method for generating column vector beams
  • Device and method for generating column vector beams

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Embodiment Construction

[0031] The basic idea of ​​the present invention is: with TEM 00 The mode beam is the input beam, and then use the spatial light modulator and related optical elements to sample it in a certain way, or use the complex filter to make the Fourier transform of the output beam into TEM 10 (or TEM 01 ) The spectrum of the mode beam is filtered on the spectrum plane of the above spectrum, and then the Fourier transform is performed to obtain the TEM 10 (or TEM 01 ) mode beam; make TEM 10 (or TEM 01 ) mode beam passes through the interferometer system, and finally synthesizes the required cylindrical vector beam. Its theoretical basis is:

[0032] Suppose the input function is a Gaussian function

[0033] g(x,y)=exp[-(x 2 +y 2 ) / w 2 ] (1)

[0034] It is easy to know that the above formula is TEM 00 The beam expression of the mode;

[0035] adopt function

[0036] g c ( x , y ...

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Abstract

The invention relates to a device and a method for generating column vector beams. TEM00 model beams outputted by a laser is changed into linearly polarized light through a polarizer after the beams are reshaped and expanded by a beam expander and a diaphragm; the beams enter a spatial light modulator or a complex filter, and form an array through an analyzer; the beams pass through a 4f system consisting of a pair of Fourier transform lenses and aperture diaphragms; the beams are added into a phase retarder for phase modulation so as to generate TEM10 (or TEM01) model beams, and are synthesized to the column vector beams by using an interference system. The device and the method have the advantages of low requirement on incident beam, simple device, easy operation, high polarization degree of the output column vector beams and the like.

Description

technical field [0001] The invention relates to an optical technology, in particular to a device and method for generating cylindrical vector beams. Background technique [0002] Radial polarized beams and azimuthal polarized beams are called cylindrical polarized beams, and they have a high degree of symmetry. Due to some characteristics of cylindrical vector beams, it can be applied to the fields of particle acceleration technology, optical tweezers, material processing, particle trapping and manipulation, large numerical aperture lenses, and some special measurement methods. For example, cylindrical vector beams can be applied to optical microscopy systems to achieve super-resolution effects, because the focal point of a certain cylindrical vector beam after focusing is smaller than the transverse spot of the focus of a linearly polarized beam in the same focusing system. The generation system of cylindrical vector beams is a necessary prerequisite for the study and util...

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Application Information

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IPC IPC(8): G02B27/09
Inventor 郭汉明蓝景恒王小亚董祥美丁左红翁晓羽庄松林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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