Nonlinear holographic generation method and device for propagation-invariant structured light field

Abstract

The invention discloses a nonlinear holographic generation method and device for a propagation-invariant structured light field, which belongs to the field of optics, and aims to solve the problems that the spectral bandwidth of a structured light field generated based on a linear process is limited, and intensity dependence exists in the structured light field generated based on a nonlinear process. The method comprises the following steps of modulating a Gaussian pump beam into a fundamental frequency beam with a spatial mode related to a frequency multiplication order by using a holographic modulation method, enabling the fundamental frequency beam to be unidirectionally incident into the k frequency doubling crystal after passing through the imaging unit, and separating the light beam emitted from the k frequency doubling crystal to obtain a frequency up-conversion light beam with a propagation invariant structure light field. In the device, a modulator modulates a Gaussian pump beam into a fundamental frequency beam with a spatial mode related to a frequency multiplication order; The fundamental frequency beam passes through the imaging unit and then is unidirectionally incident into the k frequency doubling crystal; and the separation element separates the beam emitted from the k frequency doubling crystal to obtain a frequency up-conversion light beam with a propagation invariant structure light field.

Description

technical field [0001] The invention relates to the generation technology of the propagation invariant structured light field, and belongs to the field of optics. Background technique [0002] Spatial structured light field refers to a series of light fields with unique spatial intensity and phase distribution compared with general Gaussian beams. It has a wide range of applications in fields such as resolution and quantum communication. In this context, people have proposed many novel linear light field generation and regulation technologies such as spiral phase plate, q-wave plate, holographic fork grating, etc. for the generation and regulation of structured light field. [0003] Since the discovery of optical nonlinear phenomena in 1961, its unique frequency conversion function has attracted widespread attention in the generation of ultraviolet light sources and up-conversion detection / imaging. At the end of the last century, the discovery of the orbital angular moment...

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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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