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The Study of the Speckles in the Extremely Deep Fresnel Diffraction Region

Author: ChenXiaoYi
Tutor: ChengChuanFu
School: Shandong Normal University
Course: Optics
Keywords: Random surface Fresnel deep zone Coherent speckle Partially coherent speckle
CLC: O436
Type: Master's thesis
Year: 2006
Downloads: 72
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Abstract


The scattering screen as a random phase screen the Kirchhoff approximation under conditions close to the subsequent light intensity distribution is a constant . To the Fresnel deep range of from close to the scattering screen , which we call the Fresnel diffraction deep region . The evolution of coherent speckle and partially coherent speckle formation mechanism and its statistical regularities in this region has been confusing and not research . Kirchhoff approximation theory the coherent speckle and partially coherent speckle Fresnel deep theoretical research and computer simulation . The paper is divided into five chapters . The first chapter of the random surface description of the basic principles of light scattering , the random characteristics of the light field speckle description reviewed . Chapter II Kirchhoff approximation theory , one-dimensional Gaussian - related random scattering screens , for example , the numerical calculation of the intensity distribution of the the deep region Fresnel different distance speckle , the formation of a speckle field mechanism and its statistical properties with the the scattering distance the evolution . The results show that : the geometrical optics effect in the Fresnel deep scattering beam performance , by the effect of geometrical optics as the transmission distance increases gradually evolved so as to interfere with the effects of diffraction . It is this effect that makes the speckle field of a Fresnel deep area with increasing transmission distance by the non- Gaussian speckle gradual transition to a normal distribution Gaussian speckle . The statistical properties of the speckle field , such as the statistical calculation of the probability density and contrast also confirms the reasonableness of the theoretical model . Chapter Kirchhoff approximation theory is deduced when the light source is a point light source when the expression of the speckle field , theoretical analysis when the scattering surface roughness smaller case , the point light sources along the direction parallel to the scattering surface mobile Fresnel ear deep speckle field displacement law . Chapter IV Chapter - based numerical simulation of a the scattering screen roughness smaller the Fresnel deep area partially coherent speckle field . The statistical analysis of the degree of light source line , the parameters of the scattering surface , the scattering distance of partially coherent speckle contrast , the probability density and light intensity obtained for actual easy access to the extended light source , partially coherent speckle exists only in the distance of scattering surface within the range of a few millimeters . The fifth chapter summarizes the main content of this paper to develop a follow-up plan .

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics )
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