5 September 2002 Velocities of Gaussian beam propagation in vacuum
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The variations of group velocities for Gaussian beams under different hypotheses were studied, and the rationality of the results were discussed and analysed. Then we show that the beam waist radius should be proportional to the square root ofwavelength. Under this condition, the group velocities are all equal to c on the beam axis and smaller than c off the axis.
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Shaomin Wang, Shaomin Wang, Jinxin Xu, Jinxin Xu, Daomu Zhao, Daomu Zhao, Haidan Mao, Haidan Mao, } "Velocities of Gaussian beam propagation in vacuum", Proc. SPIE 4926, Adaptive Optics and Applications II, (5 September 2002); doi: 10.1117/12.481680; https://doi.org/10.1117/12.481680

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