Theoretical And Experimental Studies Of Partially Coherent Beams Carrying Twisted Phases

In recent ten years,the manipulation of orbital-angular momentum(OAM)and the interaction between OAM and matter is poised to open entirely new opportunities in fundamental science and applications fields,including optical tweezers,imaging,increasing the capacity of communication systems and so on.In partially coherent realm,similar to the well-known vortex phase,the twist phase also has the ability to carry OAM.As the first truly non-separable quadratic phase,twist phase was introduced by Simon and Mukunda in 1993.Since its introduction,twist phase has stimulated enormous interest due to its propagation characteristics and connection with the optical vortices.In spite of tremendous progress concerning the theoretical research of twisted partially coherent beams,experimental synthesis has long been a huge challenge.Based on the previous work,a general method for customizing twisted Schell-model beams is proposed in this paper.As an example,the classical twisted Gaussian Schell mode beams are synthesized experimentally.On the other hand,the polarization characteristics of the light field are also affected by the coherent structure of the source.To figure out the impact of correlation on the polarization,the Full Poincaré beams furnished with twisted Gaussian Schell-model correlation structure are studied in detail.Similar to the Full Poincaré beams,the projection of polarization state is established.Based on this projection,the rotation angle of state of polarization as a function of propagation distance and twist factor was studied,and the evolution properties of degree of polarization are also presented.