Abstract
We introduce a method for modulating the Gaussian beam by means of sine-azimuthal wavefront and carry out the experimental generation. The analytical propagation formula of such a beam passing through a paraxial ABCD optical system is derived, by which the intensity properties of the sine-azimuthal wavefront modulated Gaussian (SWMG) beam are examined both theoretically and experimentally. Both of the experimental and theoretical results show that the SWMG beam goes through the process from beam splitting to a Gaussian-like profile, which is closely determined by the phase factor and the propagation distance. Appropriate phase factor and short distance are helpful for the splitting of beam. However, in the cases of large phase factor and focal plane, the intensity distributions tend to take a Gaussian form. Such unique features may be of importance in particle trapping and medical applications.
Highlights
We introduce a method for modulating the Gaussian beam by means of sine-azimuthal wavefront and carry out the experimental generation
It is assumed that the electric field of the sine-azimuthal wavefront modulated Gaussian (SWMG) beams in the source plane has a form of: E (0) (r, φ)
A new beam source named the SWMG beam has been introduced and its analytical propagation formula passing through a paraxial ABCD optical system is derived
Summary
We introduce a method for modulating the Gaussian beam by means of sine-azimuthal wavefront and carry out the experimental generation. The analytical propagation formula of such a beam passing through a paraxial ABCD optical system is derived, by which the intensity properties of the sine-azimuthal wavefront modulated Gaussian (SWMG) beam are examined both theoretically and experimentally. Both of the experimental and theoretical results show that the SWMG beam goes through the process from beam splitting to a Gaussian-like profile, which is closely determined by the phase factor and the propagation distance. In the cases of large phase factor and focal plane, the intensity distributions tend to take a Gaussian form Such unique features may be of importance in particle trapping and medical applications. In this paper we report the experimental generation of a sine-azimuthal wavefront modulated Gaussian (SWMG) beam on the basis of phase modulation and investigate its propagation properties through free space or a focusing system
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