Analysis of Propagating Beam Transverse-mode Evolution by Using the Wigner Distribution Function

다국어 초록 (Multilingual Abstract)

The propagation property and spatial coherence of laser beams having different transverse modes were studied experimentally. By applying the Radon transformation to the Wigner distribution function measured in our experiment, we could get complete information on the evolution of the transverse amplitude distribution of a propagating laser beam. We found that laser beams propagate in quite different ways even though the field amplitudes at the light source were similar to each other. The experimental results are explained in connection with the fractional Fourier transform,the interference of partial amplitudes, and directional coherence.

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