1. Composite spectral Stokes singularities in coherent and incoherent superpositions of partially coherent nonparaxial vortex beams
- Author
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Yunhai Jiang, Yamei Luo, Shuqiong Chen, and Baida Lü
- Subjects
Physics ,Composite number ,Paraxial approximation ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,symbols.namesake ,Superposition principle ,Critical point (thermodynamics) ,Quantum mechanics ,Vortex beam ,symbols ,Degree of polarization ,Stokes parameters ,Gravitational singularity ,Electrical and Electronic Engineering - Abstract
Taking the partially coherent cosh-Gaussian (ChG) vortex beam as an illustrative example, the composite spectral Stokes singularities formed by coherent and incoherent superpositions of partially coherent vortex beams beyond the paraxial approximation are studied, where the effect of superposition scheme on composite spectral Stokes singularities is stressed. It is shown that there exist s12 (C-points), s23 and s31 composite spectral Stokes singularities, which are variable by varying a control parameter, such as the spatial correlation length, waist width, off-axis distance, or decentered parameter, as well as the propagation distance. In particular, the number, position, degree of polarization of composite spectral Stokes singularities and the critical point at which the creation–annihilation process takes place depend on the superposition scheme. A comparison with the previous work is also made.
- Published
- 2012
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