Propagation of ultrashort pulsed beams in dispersive media
Liu Zhi-Jun (刘志军)a, Lü Bai-Da (吕百达)ab
a Institute of Laser Physics & Chemistry, Sichuan University, Chengdu 610064, China; b State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract Starting from the Rayleigh diffraction integral, the propagation equation of ultrashort pulsed beams in dispersive media is derived without making the paraxial approximation and slowly varying envelope approximation (SVEA). The spatiotemporal properties of ultrashort pulsed beams in dispersive media, such as spectrum redshifting, narrowing and pulse distortion are illustrated with pulsed Gaussian beams. It is stressed that the "antibeam" behaviour of ultrashort pulsed beams can be avoided, if a suitable truncation function is chosen.
Received: 12 December 2002
Revised: 16 January 2003
Accepted manuscript online:
PACS:
42.65.Re
(Ultrafast processes; optical pulse generation and pulse compression)
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