Laser & Optoelectronics Progress, Volume. 50, Issue 6, 62602(2013)
Superluminal Propagation of Focused Gaussian Beams
The phase velocity and the group velocity of focused pulsed light beams are studied in the vicinity of the focus of an aberration-free lens analytically and numerically. The phase anomaly caused by the diffraction leading to superluminal pulsed beam propagation is illustrated. The effect of the small shift in position between the geometrical focus and the beam waist of the focused beam on the group velocity and the phase velocity is given.
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Deng Xuanbing, Deng Dongmei, Liu Chengyi. Superluminal Propagation of Focused Gaussian Beams[J]. Laser & Optoelectronics Progress, 2013, 50(6): 62602
Category: Physical Optics
Received: Mar. 10, 2013
Accepted: --
Published Online: May. 22, 2013
The Author Email: Xuanbing Deng (dengxuanbing@163.com)