Abstract
Based on the theory of the second-order intensity moment and the method of Fourier transformation, some parameters for a broadband Gaussian beam in free space are studied analytically and numerically. It is shown that the beam width and the divergence angle for a broadband Gaussian beam in free space are both larger than those for a monochromatic Gaussian beam. The broader the bandwidth of a light beam, the larger the beam width and the divergence angle of the light beam. The beam propagation factor for a broadband Gaussian beam in free space is larger than that for a monochromatic Gaussian beam and increases slowly with bandwidth. The kurtosis parameter for a broadband Gaussian beam in free space increases with propagation distance and bandwidth. The kurtosis parameter for a broadband Gaussian beam with much broader bandwidth increases more remarkably with propagation distance.
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Mao, H., Zhao, D. Parametric characteristics for a broadband Gaussian beam in free space. Appl. Phys. B 100, 611–616 (2010). https://doi.org/10.1007/s00340-010-3920-2
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DOI: https://doi.org/10.1007/s00340-010-3920-2