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Flattened light beams with an axial shadow generated through superposing cosh-Gaussian beams

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Making use of combining NL + 1 cosh-Gaussian beams, the beams with nearly flattened top profiles and an on-axial shadow are introduced. An analytical expression of the beams propagating through a first-order ABCD system is derived. The closed expression of the beam propagation factor (M 2-factor) is presented to characterize the quality of the beams, and the kurtosis parameter is employed to describe the sharpness of such beams. Additionally, the scheme to generate such a light beam is also proposed.

Keywords: Flat-top beam; beam propagation factor; cosh-Gaussian beam; kurtosis parameter; superposition principle

Document Type: Original Article


Affiliations: 1: Department of Applied Physics and Heat Engineering, Central South University, Changsha 410083, Hunan, China 2: Department of Physics, Xiangtan Normal University, Xiangtan 411201, Hunan, China

Publication date: 2002-08-01

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