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A new concept of elliptical flattened Gaussian beam (EFGB) is proposed in terms of tensor method, which generalize the original flattened Gaussian beam into 3-dimensional cases. The propagation formula of EFGB through axially nonsymmetric optical system is derived by the generalized Collins integral. By using this formula, the propagation of EFGB in free-space is calculated and discussed. The results...
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