Effect of coma on tightly focused cylindrically polarized vortex beams

• Cylindrical polarized vortex beam with primary coma is studied.
• Focusing properties are investigated theoretically by vector diffraction theory.
• Intensity distribution in focal region plays an important role in optical systems.
• We can generating focal spot, focal hole and flattop intensity profiles.
• Its find many applications in optical trapping, laser drilling and machining.

In this paper attention is given to the effects of primary coma on the cylindrical polarized vortex beam based on the vector diffraction theory. It is observed that by properly choosing the polarization angle and topological charge one can obtain many novel focal patterns suitable for optical tweezers, laser printing and material process. However, it is observed that the focusing objective with coma generates structural modification and positional shift of the generated focal structure.