This paper studies in detail the interaction of two edge dislocations nested in a Gaussian beam propagating in free space.It shows that in free-space propagation the edge dislocations are unstable and vanish,and two noncanonical vortices with opposite topological charge take place when off-axis distances c 1 and c 2 of two edge dislocations are nonzero,and the condition k 2 w 8 0 + 32c 1 c 2 (w 2 0 2c 1 c 2)z 2 > 0 is fulfilled (k-wave number,w 0-waist width).A noncanonical vortex appears when one off-axis distance is zero.However,one edge dislocation is stable when two edge dislocations are perpendicular and one off-axis distance is zero.Two perpendicular edge dislocations both with zero off-axis distance are also stable.The analytical results are illustrated by numerical examples.
This paper derives the explicit expressions for the average intensity, beam width and angular spread of Gaussian Schell-model (GSM) beams with edge dislocation propagating through atmospheric turbulence along a slant path. The propagation of GSM beams with edge dislocation through horizontal atmospheric turbulence can be treated as a special case through a slant one. The propagation properties of GSM beams with edge dislocation through slant atmospheric turbulence are studied, where the influence of edge dislocation parameters including the slope p and off-axis distance d on the spreading of GSM beams with edge dislocation in atmospheric turbulence is stressed. It shows that the spreading of the intensity profile of GSM beams with edge dislocation along a slant path is smaller than that along a horizontal path in the long-distance atmospheric propagation. The larger the slope |p| and the smaller the off-axis distance |d| are, the less the beam-width spreading and angular spread of GSM beams with edge dislocation are affected by turbulence. The GSM beams with edge dislocation is less affected by turbulence than that of GSM beams without edge dislocation. The results are illustrated numerically and their validity is interpreted physically.
