title: Relative phase shifts of apertured Gaussian beams and transformation of a Gaussian beam through a phase aperture.
abstract: When a Gaussian beam is apertured, it undergoes a focal shift as well as a phase shift. The focal shift has been investigated extensively although the phase shift has seldom been discussed. We analyze the phase shift of the apertured Gaussian beam. Furthermore we point out that the phase aperture may be used to transform the intensity distribution of the Gaussian beam to obtain a more concentrated beam, to realize uniformity of the Gaussian beam, and to obtain a ring beam.
authors.affiliation: Department of Applied Physics, National University of Defense Technology, Changsha, 410073 China.
authors.forename: Z
authors.initials: Z
authors.lastname: Jiang
authors.forename: Q
authors.initials: Q
authors.lastname: Lu
authors.forename: Z
authors.initials: Z
authors.lastname: Liu