The Research In Propagations And Properties Of Partially Coherent Beams

In this thesis,we study the propagation and properties of partially coherence beams,mainly includes the self-healing properties of the Hermite-Gaussian correlated Schell-model beam in free space,the vortex preserving properties of statistical optical beams,the anti-atmospheric turbulence properties of dark and anti-dark diffraction free beams and the generation and transmission properties of perfect optical coherence lattices.In the study of the self-repairing properties of the Hermite-Gaussian Correlated Shell-model,we discuss the effects of the distance between obstacle and beam source and the distance between the receiver and the obstacle on both numerical simulation and experiment realization.We find that the closer the distance between the obstacle and the light source,the further the distance between the receiver and the obstacle,the better the self-healing effect.The results exhibit that the coherence degree of the Hermite-Gaussian correlated Schell-model beam is fundamental in determining the self-healing ability.In addition,to further quantify the self-healing effectg,we introduce a new similarity calculation formula.In the study of statistical optical beams with vortex preserving properties,we develop a general model of partially coherent beams based on pseudo-model theory that can still retain vortex properties through free space transmission and in ABCD optical systems.To demonstrate the theoretical results,we also introduce a new partially coherent vortex beams with radially sinc correlated function and investigate their ability to retain vortex properties during propagation.To measure the ability of such beams to trap nanoparticle,we also investiggate their scattering forces.In the study of the transport properties and scintillation factors of dark and anti-dark diffraction-free beams in atmospheric turbulence,we theoretically found that dark and anti-dark beams have the property of maintaining their light intensity distribution in atmospheric turbulence at the cost of attenuating their peak light intensity,and this property is not disturbed by the intensity of atmospheric turbulence.To test the theoretical conclusion,we have performed numerical simulations of the beam transmission,which agree well with the results obtained from the theoretical calculations,and further studies have shown that the dark and anti-dark beams have a lower scintillation factor than conventional partially coherent beams.In the study of perfect optical coherence lattices,we propose a new scheme for generating optical coherence lattices.The optically coherent grating generated by this scheme does not have any additional envelope field.Adjusting the amplitude and phase distribution of the Fourier plane of the optical system in the scheme is the core of it.The node properties of the optical coherence lattices generated by the scheme are determined only by the input partially coherence beams,and the structure of the optical coherence lattices are determined only by the frequency spectrum of the Fourier transmission plane in the optical system.The results achieved through numerical simulations and experiments are consistent and the theory is verified.