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Device for generating diffraction-free needle-shaped light field

A non-diffraction, needle-type technology, applied in the field of modern photonics, can solve the problem of insufficient conversion efficiency, and achieve the effect of low cost, simple optical path and high flexibility

Active Publication Date: 2016-05-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods are based on the single-focus focal field control method. The influence of diffractive optical elements leads to different degrees of energy loss in the generation process, and the conversion efficiency is not high enough.

Method used

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  • Device for generating diffraction-free needle-shaped light field
  • Device for generating diffraction-free needle-shaped light field
  • Device for generating diffraction-free needle-shaped light field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Such as figure 1 Shown is a device for generating a non-diffraction needle-shaped light field, including a beam expander collimation system, a radial polarization change vector beam generation system, and a needle-shaped light field detection system; the beam expander collimator system includes a concave lens 2 and a second A convex lens 3, the radial polarization change vector beam generating system includes a spatial light modulator 4, a second convex lens 5, a 1 / 4 wave plate 6, a third convex lens 7 and a Ronchi grating 8, and the needle-shaped light field detection system Including a fourth convex lens 9, an electric displacement platform 10 and a beam analyzer 11, the second convex lens 5 and the third convex lens 7 form a 4F system, and the beam analyzer 11 is fixed on the electric displacement platform 10;

[0019] The laser beam 1 output by the laser pa...

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Abstract

The invention discloses a device for generating a diffraction-free needle-shaped light field. The device comprises a beam-expanding collimation system, a radial polarization change vector light beam generation system and a needle-shaped light field detection system. Linearly-polarized light beams with uniform light intensity are generated via the beam-expanding collimation system by means of light beams that are outputted by a laser. Then radial polarization change vector light beams are generated by a spatial light modulator, a 4F system and a Ronchi grating. The radial polarization change vector light beams are focused to generate light needles. By means of the method of the invention, the light path is simple and the device manufacture cost is low. Compared with needle-shaped light fields that are currently generated by using diffractive optical elements, the needle-shaped light field generated by the invention achieves the light intensity and the polarization state which are generally kept unchanged within the focal depth distance, so that the interaction between light and matter is greatly enhanced, and the invention has important applications for optical micromechanics and non-linear optics.

Description

technical field [0001] The invention relates to a non-diffraction needle-shaped light field generation technology, in particular to a needle-shaped light field generation technology based on space-varying polarization state regulation, which can be used for super-resolution imaging, optical nano-manufacturing, optical capture and manipulation, etc., and belongs to The field of modern photonics. Background technique [0002] In recent years, the needle-shaped light field with the characteristics of small cross-section and long depth of focus has received extensive attention due to its potential application prospects in the fields of particle acceleration, fluorescence imaging, second harmonic and Raman spectroscopy. . [0003] Initially, people used axicons or holographic Axilens to extend the depth of field, generating a needle-shaped focal field. However, due to the effect of diffraction, the axial intensity of the beam fluctuates significantly, resulting in low conversio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09G02B27/28G02B27/42G01J1/00
CPCG01J1/00G02B27/0911G02B27/0938G02B27/0944G02B27/286G02B27/4233
Inventor 顾兵万勇任泊晓刘达辉芮光浩崔一平
Owner SOUTHEAST UNIV
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