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Photon full-angular momentum state generation method and system based on cascaded light modulators

A technology of light modulator and spatial light modulator, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problem of inability to continuously adjust the structural beam and achieve good operability

Inactive Publication Date: 2020-04-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a photon full-angle momentum state generation method and system based on cascaded optical modulators.

Method used

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  • Photon full-angular momentum state generation method and system based on cascaded light modulators
  • Photon full-angular momentum state generation method and system based on cascaded light modulators
  • Photon full-angular momentum state generation method and system based on cascaded light modulators

Examples

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Embodiment 1

[0036] Example 1: Generation of Separable Full Angle Momentum State Structured Beam

[0037] A separable full angular momentum state is defined as a form in which the spin angular momentum state is directly multiplied by the orbital angular momentum state. image 3 For the separable full-angle momentum state structured beam actually generated by the method and system of the present invention, the first behavior is |L>|+1>, and the second behavior is |R>|+3>. image 3 At the same time, its cross-sectional polarization distribution is also given.

Embodiment 2

[0038] Example 2: Beams of non-separable full-angle momentum state structured beams with cross-sectional isotropic polarization distribution

[0039] The inseparable full angular momentum state is defined as being unable to be represented by the direct multiplication of the spin angular momentum state and the orbital angular momentum state. In this embodiment, we have actually generated a cross-sectional term Inseparable full-angle momentum-state structured beams with the same polarization distribution, such as Figure 4 As shown, the first row |Ψ 1 >=|R>(|-3>+|-1>+|+1>+|+3>)+|L>(|-3>+|-1>+|+1>+|+3> ), the second behavior |Ψ 6 >=|R>(|-3>+|-1>+|+1>+|+3>)+exp(iπ)|L>(|-3>+|-1>+|+1>+ |+3>). Figure 4 At the same time, the polarization state distribution of its cross section is also given. It can be seen that after introducing an additional π phase for the left-handed circular component, the polarization state changes from horizontal linear polarization to vertical linear polar...

Embodiment 3

[0040] Example 3: Beams of inseparable full-angle momentum state structured beams with cross-sectional anisotropic polarization distribution

[0041] In this embodiment, we have actually generated an inseparable full-angle momentum state structured beam with cross-sectional anisotropic polarization distribution through the method and system described in the present invention, such as Figure 5 As shown, the generated full angular momentum pattern is |Ψ>=|R>(|-1>+|+1>)+|L>|+2>.

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Abstract

The invention discloses a photon full-angular momentum state generation method and system based on cascaded light modulator. Two liquid crystal spatial light modulators are cascaded to modulate orbital angular momentum state distribution on two spin angular momentum components of a fundamental mode Gaussian beam to generate a full-angular momentum state structure beam. Due to the electric controlcharacteristics of the liquid crystal spatial light modulators, continuous and adjustable generation of the mode of any full-angular momentum state structure light beam can be realized on the premiseof not replacing any optical element in the system. The system is simple in structure and easy to control, and has great progress compared with the prior art.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a method and system for generating photon full-angle momentum states based on cascaded optical modulators. Background technique [0002] As early as 1909, the British scientist Poynting predicted that circularly polarized light carries angular momentum, and when the polarization state of light is converted, it must be accompanied by the exchange of angular momentum with the optical system. This angular momentum is the spin angle of the photon Momentum, which has only two eigenvalues ​​of ±1, macroscopically corresponds to the left-handed and right-handed circular polarization states of the light beam. In addition to spin angular momentum, photons can also carry another kind of angular momentum, namely orbital angular momentum. In 1992, Dutch scientist Allen et al. found that the orbital angular momentum is an inherent property of a vortex beam with a helical wavefront, a...

Claims

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Application Information

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IPC IPC(8): G02F1/01G02F1/1335G02F1/13363G02F1/1347
CPCG02F1/0136G02F1/133528G02F1/13363G02F1/1347G02F1/133638
Inventor 付时尧高春清周恒
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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