Dynamic column vector light field generating device and method based on optical heterodyne interference method

An optical heterodyne and cylindrical vector technology, applied in optics, optical components, nonlinear optics, etc., can solve problems such as slow regulation speed

Active Publication Date: 2020-09-18
PEKING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of existing cylindrical vector light field generation and dynamic control technology, the present invention proposes a dynamic cylindrical vector...

Method used

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  • Dynamic column vector light field generating device and method based on optical heterodyne interference method
  • Dynamic column vector light field generating device and method based on optical heterodyne interference method
  • Dynamic column vector light field generating device and method based on optical heterodyne interference method

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Embodiment 1

[0055] Such as figure 1 As shown, the present embodiment adopts a vortex half-wave plate with a topological charge of 1, and the cylindrical vector light field generation control device based on the optical heterodyne interferometry includes: a laser light source 1, a first plano-convex lens 2 with two different focal lengths A beam expander and collimation device composed of a second plano-convex lens 3, a half-wave plate 4, a first polarizing beamsplitter prism 51, a first acousto-optic frequency shifter 61, a second acousto-optic frequency shifter 62, and a second polarizing beamsplitter prism 52 , a quarter-wave plate 7 and a vortex half-wave plate 8 with a topological charge of 1; wherein, the laser light source 1 produces a highly coherent linearly polarized Gaussian beam with a frequency of f 0 The linearly polarized Gaussian beam is expanded and collimated by the beam expander and collimator, and converted into a linearly polarized Gaussian beam whose spot size matches...

Embodiment 2

[0057] Such as figure 2 As shown, this embodiment adopts a vortex phase plate with a topological charge of 1 and a vortex phase plate with a topological charge of -1, and the control device for generating a cylindrical vector light field based on optical heterodyne interferometry includes: a laser light source 1, A beam expander collimation device composed of two first plano-convex lenses 2 and second plano-convex lenses 3 with different focal lengths, a half-wave plate 4, a polarization beam splitter prism 5, a first acousto-optic frequency shifter 61, and a second acousto-optic frequency shifter Device 62, depolarizing beam splitter prism 9, first quarter-wave plate 71, second quarter-wave plate 72, vortex phase plate 81 with topological charge of 1 and vortex phase plate with topological charge of -1 82; wherein, the laser source 1 produces a highly coherent linearly polarized Gaussian beam with a frequency of f 0 The linearly polarized Gaussian beam is expanded and colli...

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Abstract

The invention discloses a dynamic column vector light field generating device and method based on an optical heterodyne interference method. High-speed continuous rotation of the polarization direction of the linearly polarized Gaussian light is realized through an optical heterodyne interference method, and the linearly polarized Gaussian light with high-speed rotation of the polarization direction is further converted into dynamic column vector polarized light with high-speed conversion; the dynamic regulation and control speed of the column vector light field can be improved by 6 orders ofmagnitudes; the whole device is not provided with a mechanical motion assembly, and a generated dynamic column vector light field is stable and reliable; the generated high-speed dynamic column vectorlight field can be applied to the fields of optical communication, optical sensing, laser processing, optical capture, optical super-resolution and the like, and the time consumed for regulating andcontrolling the light field in application can be greatly saved; the device has the advantages of continuous polarization regulation, high stability, large regulation range and high response speed. Ahigh-speed switching dynamic column vector light field is generated; the change frequency of the column vector light field is changed by changing the frequency of a radio frequency signal for drivingthe acoustic optical modulator.

Description

technical field [0001] The invention relates to a time-domain regulation technology of a vector light field, in particular to a cylindrical vector light field generation regulation device based on an optical heterodyne interferometry and a control method thereof. Background technique [0002] A cylindrical vector beam is a vector beam solution to Maxwell's equations, and the spatial distribution of its polarization state, amplitude, and phase has cylindrical symmetry. Radially polarized light and azimuthally polarized light are two special cases of cylindrical vector polarized light, in which radially polarized light can be tightly focused to generate a strong longitudinal electric field at the focal plane, while azimuthally polarized light can be tightly focused to produce a hollow spot at the focal plane. Due to the special polarization distribution and focusing characteristics of cylindrical vector beams, it has been widely used in many fields, such as optical trapping, s...

Claims

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Application Information

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IPC IPC(8): G02B27/28G02F1/11
CPCG02B27/283G02B27/286G02F1/11
Inventor 施可彬刘伟董大山杨宏龚旗煌
Owner PEKING UNIV
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