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A method for generating Laguerre-Gaussian vortex beams

A technology of vortex beams and generation methods, which is applied in optics, lasers, optical components, etc., can solve the problems of the near-field rapid change characteristics of limited Gaussian vortex beams, and achieve the effect of compact structure and small divergence

Active Publication Date: 2020-04-03
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] However, with the help of existing laser amplification technologies, such as optical parametric chirped pulse amplification or chirped pulse laser amplification technology, the direct amplification of Gaussian vortex beams is limited by the fast-changing characteristics of Gaussian vortex beams in the near field.

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  • A method for generating Laguerre-Gaussian vortex beams

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Embodiment Construction

[0030] figure 1 It is a structural schematic diagram of a method for obtaining a Laguerre-Gaussian vortex beam according to the present invention. As can be seen from the figure, a method for obtaining a Laguerre-Gaussian vortex beam of the present invention mainly includes a phase modulation element, a lens group f 1 and f 2 The 4f image transfer system constituted, the filter aperture above the common focal plane of the lens. The phase modulation element can be a helical phase plate, a spatial light modulator, or a q-wave plate. by the lens group f 1 and f 2 The 4f image transfer system constituted, f 1 and f 2 May not be equal. when f 1 > f 2 When , the lens group is a beam shrinking device; when f 1 2 When , the lens group is a beam expander; when f 1 = f 2 , the lens group is strictly an image transfer device. The filter pinhole is located on the rear focal plane of the first lens of the lens group and also on the front focal plane of the second lens. Its siz...

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Abstract

The invention discloses a generation method of a Laguerre Gaussian vortex light beam. The method comprises the steps of optimizing the aperture of a filtering small hole, building and adjusting a light path and the like. According to the invention, a-4F image transmission and spatial filtering device in a large-scale laser system and the characteristics of simplicity and easiness in operation areutilized. The spiral characteristic of wavefront is not influenced by the circular hole filtering operation in the frequency domain. The Gaussian vortex light beam is converted into a Laguerre Gaussian vortex light beam by calculating and selecting an optimal filtering aperture. The defect that the light intensity of a traditional Gaussian vortex light beam changes along with the propagation distance is overcome. The Gaussian vortex light beam can be used for generating relativistic magnitude vortex laser pulses with wide application prospects in combination with the optical parameter chirp pulse amplification or chirp pulse laser amplification technology.

Description

technical field [0001] The invention relates to an ultra-intense ultra-short laser system, in particular to a method for obtaining a Laguerre-Gaussian vortex beam suitable for optical parameter chirped pulse amplification or chirped pulse laser amplification. Background technique [0002] With the rapid development of ultra-intense and ultra-short laser technology, the exploration and research on the interaction between light and matter has entered the field of relativity. The electric field of ultra-intense and ultra-short laser pulses can reach or even exceed the atomic Coulomb field10 9 On the order of V / cm, the corresponding peak intensity is about 10 14 -10 15 W / cm 2 . At this time, the electric field of the laser can already affect and manipulate the process of electron movement, distribution and ionization in atoms. When the light intensity is further increased to 10 17 -10 18 W / cm 2 After that (a hundred terawatt-level laser can be achieved), at this time, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/00G02B27/09
Inventor 梁晓燕潘望军徐露
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI