Apparatus for generating controllable super-Rayleigh speckle field and method for generating the same

Abstract

The invention discloses an apparatus for generating a controllable super-Rayleigh speckle field and a method for generating the same. The generating apparatus includes a continuous wave laser, a computer I and a computer II. Along the progressing direction of a light beam of the continuous wave laser there is successively provided with an adjustable laser attenuator, a pinhole filter, a lens, a polarizer I and a beam splitter. From the beam splitter, the light beams is divided into two light beams which progress along two different directions, and along the progressing direction of one light beam there is provided with a reflecting spatial light modulator, and along the progressing direction of the other light beam there is provided with an analyzer I, a diaphragm I, a polarizer II, a transmission type spatial light modulator, an analyzer II, a diaphragm II, a Fourier lens and a CCD camera, wherein the reflex spatial light modulator is connected to the CCD camera and the computer I, and the transmission-type spatial light modulator and the computer II are connected. According to the invention, the values of an exponential factor S and an angular index m are changed to obtain a target super-Rayleigh speckle field, so that the super-Rayleigh speckle field which has a controllable speckle size and contrast ratio is obtained.

Description

Technical field [0001] The invention relates to the technical field of optical testing and microscopy applications, and in particular to a manufacturing device capable of regulating and controlling the super-Rayleigh speckle field and a manufacturing method thereof. Background technique [0002] When coherent light is irradiated on the scattering medium, a granular speckle pattern of light and dark will be generated in the transmitted or reflected field; the speckle is formed by the spatial coherence of the scattered wavelets of the scattering particles. If the surface fluctuation of the scattering medium is greater than the wavelength of the incident light, the intensity distribution of the speckle light field conforms to the Rayleigh statistics, and the light intensity of the speckle field follows the negative e-index distribution; for the Rayleigh speckle field, its speckle pattern The contrast value is 1. [0003] Many basic research and application fields require that the sta...

AI Technical Summary

Problems solved by technology

Since speckle research belongs to the field of compound statistical optics, for the same detection plane, if the speckle size is too large, the number of speckles in the detection plane will be too small, so that the number of sampling points in the sample is too small and the analysis error will be large; however, If the speckle size is too small, too many sampling points in the detection plane will lead to a surge in calculation and reduce the data processing efficiency; therefore, it is very important to control the speckle size in the speckle field

Images