A method and device for generating partially coherent light beams with vector special spatially correlated structures

Abstract

The invention discloses a method and a device for generating partly coherent beams of vector special space correlation structures. After the light emitted by the excitation source is focused and split by the focusing system, two beams are obtained; the beams are respectively reflected by the mirror, and then enter the two resonant cavities from the coated concave mirror, and the linearly polarized beams whose polarization directions are perpendicular to each other are obtained after polarization processing. , After vector synthesis, the working material and coupling treatment are performed, and then the light intensity of the beam is shaped. After Fourier transform, the light intensity of the beam is modulated with a Gaussian distribution to obtain a partially coherent beam with a special spatial correlation structure of the vector. The device provided by the invention is simple in structure, easy to operate, and can support high-power, multi-mode output; and can realize the distribution of different spatial correlation structures by replacing the amplitude attenuation sheet; and realize output of different polarization states through phase compensation. The beam generated by the device has important application value in particle capture, laser communication, information encryption, high-quality imaging, thin film detection, etc.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to a method and device for generating a partially coherent light beam with a special space correlation structure of a vector, and particularly relates to the intracavity design and extracavity modulation of the light beam. , high-quality speckle-free imaging, and free light communication have important roles and prospects. Background technique [0002] Laser beam has four characteristics: high coherence, high collimation, high intensity and good monochromaticity. Therefore, since the appearance of laser, it has attracted the attention of researchers and carried out in-depth and extensive research. Facts have proved that laser has played a great role in the fields of military, civilian and scientific research, such as laser guidance, laser ranging, laser communication, strong laser weapons, laser information storage, laser beauty, laser treatment of myopia, laser cutting, Laser hot coa...

AI Technical Summary

Problems solved by technology

[0009] For multimode lasers, the more output modes, the lower the coherence of the beam. However, due to the influence of the size of the cavity mirror and the design of the resonator, the number of modes that can be supported in the cavity of the common multimode laser is limited, so its coherence has a certain value range, and it cannot reach the completely incoherent state

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