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Method and device for generating perfect Laguerre-Gaussian beam

A technology of Gaussian beams and Laguerre, applied in the field of optics, can solve the problem of not being able to represent the optical resonant cavity mode of a stable spherical mirror, and achieve the effect of simple structure, easy adjustment, and good stability

Inactive Publication Date: 2014-07-23
SUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the perfect Laguerre-Gaussian beam cannot represent the stable spherical mirror optical resonator mode, and the research on it is basically theoretical, and the research on the perfect Laguerre-Gaussian beam has not been reported so far.

Method used

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  • Method and device for generating perfect Laguerre-Gaussian beam
  • Method and device for generating perfect Laguerre-Gaussian beam
  • Method and device for generating perfect Laguerre-Gaussian beam

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Embodiment 1

[0036] See attachedfigure 1 , which is a structural schematic diagram of a perfect Laguerre-Gaussian beam generating device provided in this embodiment, which includes: a laser 1, an attenuation plate 2, a plane mirror 3, convex lenses 4, 5 and 9, and a spatial light modulator 6 , circular aperture diaphragm 7, spiral phase plate 8, beam profiler 10, computers 11 and 12.

[0037] Laser 1 is a semiconductor-pumped solid-state laser with adjustable power (maximum power 1.8W, wavelength 532nm). The Gaussian beam emitted is adjusted by the attenuator 2 to adjust the beam intensity, and then reflected by the plane mirror 3 to change the propagation direction. The attenuator 2 It is a circular gradient density filter; in this embodiment, the Gaussian beam is expanded through the convex lenses 4 and 5, and the convex lenses 4 and 5 can also be expanded by a beam expander (such as the model is Beam-Expander 2-8×, 532nm, LINOS) Instead; the expanded Gaussian beam passes through the spa...

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Abstract

The invention relates to a method and device for generating a perfect Laguerre-Gaussian beam. After a Gaussian beam is expanded, a spatial light modulator of a computer-generated hologram is loaded and used for regulating a light field, a first-level diffraction beam emitted by the spatial light modulator is captured, and then a hollow Gaussian beam is obtained; phase modulation is conducted through a spiral phase plate, so that a hollow beam carrying orbital angular momentum is obtained; focusing is conduced through a convex lens, so that the perfect Laguerre-Gaussian beam is obtained. According to the method and device for generating the perfect Laguerre-Gaussian beam, the perfect Laguerre-Gaussian beam is generated through the hollow beam carrying the orbital angular momentum, the method is simple and reliable, and the device is simple in structure, easy to adjust and good in stability; the generated beam can be applied to the fields such as the particle capturing field, the free space optical communication and the beam transmission characteristic research field.

Description

technical field [0001] The present invention relates to the field of optics, in particular to a method and device for generating Elegant Laguerre-Gaussian beams, and the generated beams can be applied to particle trapping, free-space optical communication, and research on beam transmission characteristics and other fields. Background technique [0002] The Laguerre-Gaussian beam has a spiral phase structure. In the mathematical expression, it is specifically expressed that its phase factor has the same rotation azimuth angle a proportional item ,in i is the imaginary unit (i.e. the root of -1), m Usually an integer, also known as a topological charge, which corresponds to the number of phase rotations in an optical wavelength. The beam presents a spiral wavefront characteristic around the phase singularity. Theoretical analysis and experimental verification show that each photon in this type of beam has a definite orbital angular momentum ( , is Planck's constant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09
Inventor 赵承良董元赵陈晨蔡阳健
Owner SUZHOU UNIV
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