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A nonlinear holographic generation method and device for propagating invariant structured light field

A structured light and holographic technology, applied in the field of optics, can solve problems such as the limitation of the spectral bandwidth of the structured light field and the dependence of the intensity of the structured light field, and achieve the effect of high mode purity

Active Publication Date: 2021-12-10
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the spectral bandwidth of the structured light field generated based on the linear process is limited, and the problem of the intensity dependence of the structured light field generated based on the nonlinear process is to provide a nonlinear holographic generation that propagates an invariant structured light field Method and device

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  • A nonlinear holographic generation method and device for propagating invariant structured light field
  • A nonlinear holographic generation method and device for propagating invariant structured light field
  • A nonlinear holographic generation method and device for propagating invariant structured light field

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Embodiment Construction

[0038] This embodiment provides a nonlinear hologram generating method for propagating an invariant structure light field, the method generally, can include:

[0039] Step S1, use hologram modulation to modulate the Gaussian pump beam to have a baseband beam with a spatial mode associated with the multiplier step, specifically, a spatial light modulator, a digital micromirror, calculating holographic grating or Q wave plates. Modulation, the light field expression of the baseband beam is:

[0040]

[0041] in, For the base frequency field, K is an integer, and K≥2, For the dissearchers of the propagation constant structure;

[0042] In step S2, the baseband beam is incident in the K multiplier crystal after passing through the imaging unit, and the imaging unit can adopt a 4F imaging system;

[0043] In step S3, the beam emitted from the K multiplier crystal is separated by the bid-chromatic frame to obtain a frequency conversion beam having a propagation constant structural l...

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Abstract

A nonlinear holographic generation method and device for propagating an invariant structured light field, belonging to the field of optics, the purpose is to solve the problem of the limited spectral bandwidth of the structured light field generated based on the linear process and the intensity dependence of the structured light field generated based on the nonlinear process sex issue. The method includes: using a holographic modulation method to modulate a Gaussian pump beam into a fundamental-frequency beam having a spatial mode related to the order of frequency doubling; making the fundamental-frequency beam unidirectionally incident into a k-frequency doubling crystal after passing through an imaging unit; The beam emitted from the k-frequency doubling crystal is separated to obtain a frequency up-converted beam with a propagating invariant structured light field. In the device, the modulator modulates the Gaussian pump beam into a fundamental frequency beam having a spatial mode related to the order of frequency doubling; the fundamental frequency beam is unidirectionally incident on the k-frequency doubling crystal after passing through the imaging unit; the separation element pairs The beam emitted from the k-frequency doubling crystal is separated to obtain a frequency up-converted beam with a propagating invariant structured light field.

Description

Technical field [0001] The present invention relates to the production technique propagating the constant structural light field, which is an optical field. Background technique [0002] Spatial Structure Light field refers to a series of light fields that have unique spatial intensity and phase distribution, which makes the structural light field in the light field, particle control, optical imaging, superficial light field distribution and optical characteristics. Dismissal, quantum communications and other fields have a wide range of applications. In this context, there are many novel linear light field generation and regulation techniques such as spiral phase plates, Q wave films, holographic fork gratings such as spiral phase plates, Q wave films, holographic fork gratings. [0003] Since 1961, optical nonlinear phenomena has been found, and its unique frequency conversion function has caused widespread attention in terms of ultraviolet source generation and upper conversion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09G02F1/37
CPCG02B27/0927G02B27/0944G02B27/0938G02F1/37
Inventor 朱智涵吴海俊高玮史保森
Owner HARBIN UNIV OF SCI & TECH
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