科研之友
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摘要
Phase velocity plays a key role in wave-matter interactions where phase matching is essential. Laser acceleration of electrons is a good example. We have derived an exact formula with two deductions of the phase velocity for a monochromatic wave field in homogeneous medium from the fundamental wave equation. The core of these formulae is that the phase velocity is sufficiently determined in terms of the wave amplitude with no explicit reference to the phase. We applied these formulae to make out the phase velocity distribution of a Gaussian laser beam and compared with the traditional method.
- 出版日期2007-2
- 单位复旦大学
