It is proved theoretically in this paper that the field patterns of the traveling modes in a weakly guiding optical fiber are quite similar with those of the fiber-emitted modes in the far-field region. 本文从理论上论证了弱波导光纤的出射光在衍射远区的场分布与光纤内部实际传输模的场分布具有相似的关系。
The authors have derived the space-time correlation functions of complex amplitude and intensity fluctuations for far-field diffraction region, with which the statistical properties of time-varying speckle pattern could be described completely. 推导出远场时变散斑振幅涨落及光强涨落的空-时相关函数,它们完整地描述了远场时变散斑的统计性质。
Motion measurement of a diffuser by using space-time correlation of dynamic speckle in far-field region 利用散斑空一时相关性测散射体的慢运动