A light field control method for fast rotation of light intensity and polarization

A fast and polarized technology, applied in optics, optical components, instruments, etc., can solve the problem of inability to change the light field rapidly, and achieve the effect of improving irradiation uniformity and suppressing backscattering

Active Publication Date: 2021-03-26
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, continuous phase plate, spectral angular dispersion technology and polarization smoothing technology cannot make the light field change rapidly on the picosecond time scale

Method used

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  • A light field control method for fast rotation of light intensity and polarization
  • A light field control method for fast rotation of light intensity and polarization
  • A light field control method for fast rotation of light intensity and polarization

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Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, the center wavelength of the two sub-beams of the sub-beam pair is 351nm, and the wavelength difference is The topological charge of the spiral phase plate used is ±2.

[0043] figure 1 After two sub-beams are superimposed in the near field, the light intensity distribution changes with time. The results in the figure fully demonstrate the effectiveness of the control method of the light intensity and polarization fast rotating light field described in the present invention.

[0044]Through the display of the above-mentioned embodiment 1 and the accompanying drawings, it is shown that the light field control method for fast rotation of light intensity and polarization according to the present invention can make the light field quickly rotate in the near field.

Embodiment 2

[0046] In this embodiment, the center wavelength of the two sub-beams of the sub-beam pair is 351nm, and the wavelength difference is The aperture is 360×360m, the focal length of the focusing lens is f=7.7m, and the topological charge of the spiral phase plate used is ±2.

[0047] figure 2 It is a schematic diagram of an ICF device using the light field regulation method of light intensity and polarization fast rotation in the present invention. For the convenience of comparison, the fast rotating optical field control method is combined with two-dimensional SSD, wherein, the parameters of two-dimensional SSD refer to literature (Zheqiang Z, Jian W, Pengcheng H, et al.Multidirectional smoothing by spectral dispersion scheme based on hybrid dispersion grating[J].Journal of the Optical Society of America B,2018,35(7):1741) to select, that is, the frequency of time phase modulation ωm=17GHz, and the modulation depth δ=2.33.

[0048] Figure 3 ~ Figure 5 When the method for ...

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Abstract

The invention relates to a regulation and control method for a rapid light intensity and polarization rotation light field. According to the method, a laser array is divided into sub-beam pairs whichare combined in pairs; a frequency difference exists between two sub-beams of each sub-beam pair, the sub-beams are changed into different vortex beams through different spiral phase plates respectively, then the vortex beams are changed into left-rotating circularly polarized light and right-rotating circularly polarized light through different polarization control plates respectively, and finally the two sub-beams are superposed to generated the rapid light intensity and polarization rotation light field. The light field can be used for improving the uniformity of far-field focal spots of the laser array and reducing back scattering of laser in plasma.

Description

technical field [0001] The invention relates to a light field control method, in particular to a light field control method for fast rotation of light intensity and polarization. Background technique [0002] In the laser-driven inertial confinement fusion (ICF) device, a variety of spatial and temporal beam smoothing techniques are widely used to control the uniformity of the far-field focal spot of the laser beam to meet the requirements of physical experiments. Controllable precision target surface light field distribution. In the existing spatial beam smoothing technology, a continuous phase plate (Continuous Phase Plate, CPP) is often used to control the envelope of the far-field focal spot of the laser beam, but due to the coherent superposition of the sub-beams inside the laser beam, the far-field Speckle structure exists inside the spot. This type of speckle structure will lead to the generation of various nonlinear instability effects during the interaction betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/48G02B27/28
CPCG02B27/281G02B27/286G02B27/48
Inventor 钟哲强易木俣张彬孙年春
Owner SICHUAN UNIV
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