Propagation Characteristics Of Novel Partially Coherent Beams With Second-order Cubic Phase Manipulation Through Complex Optical Systems

Field manipulation of partially coherent light is one of research hot topics in Optics.Most of studies focused on amplitude manipulation of the complex degree of coherence.Recently,it has been found that partially coherent beams with phase manipulation exhibit novel propagation characteristics.In this thesis,propagation characteristics of partially coherent beams with secondorder cubic phase manipulation through free space,turbulent atmosphere and a lens system limited by hard-edged aperture are studied.By using some mathematical techniques,a simple propagation equation of spectral density of partially coherent beams with second-order cubic phase manipulation through free space,turbulent atmosphere and a lens system limited by a hard-edged aperture are derived,and efficient numerical simulations are done in matlab.The effects of phase manipulation parameter,refractive index parameter of atmospheric,aperture size and propagation distance on propagation characteristics of novel partially coherent beams are analyzed.Results show that phase manipulation parameter has great influence on the propagation characteristics of novel partially coherent beams.The novel partially coherent beams in free space can maintain the stable pattern with triangular main lobe and unilateral crescent-shaped sidelobe,but they becomes more and more divergent as the propagation distance increases.The turbulent atmosphere has great influence on the spectral density in the far field of novel partially coherent beam,and the aperture size has no obvious influence on the spectral density of novel partially coherent beam in the focal plane of a lens.The propagation characteristics of partially coherent beams with second-order cubic phase manipulation through complex optical systems are obtained in this thesis.These research results provide theoretical basis for exploring their practical applications in beam shaping,particle capture and transport,laser communication and so on.