强激光与粒子束, 2004, 16 (1): 5, 网络出版: 2006-05-15
超短脉冲贝塞尔光束的非近轴效应对传输的影响
Non-paraxial effect of ultrashort pulsed Bessel beams on their propagation
摘要
对超短脉冲贝塞尔光束在近轴近似和非近轴情况下自由空间中的传输作了研究.结果表明,其空间波形在传输中保持贝塞尔形状不变,不受非近轴效应影响;然而当空间参数较大时,非近轴效应影响超短脉冲贝塞尔光束的时间波形.
Abstract
The propagation of ultrashort pulsed Bessel beams in free space within and beyond the paraxial approximation is studied. It is shown that the non-paraxial effect does not affect their spatial pulse profile, which retains the Bessel shape unchanged upon propagation, whereas it affects their temporal pulse form if the spatial parameter α becomes relatively large. The condition, under which the paraxial approximation is valid, is found to be α<ωmin/2c, where ωmin denotes the minimum frequency of the pulse spectrum and c is the velocity of light.
刘志军, 吕百达. 超短脉冲贝塞尔光束的非近轴效应对传输的影响[J]. 强激光与粒子束, 2004, 16(1): 5. LIU Zhi-jun, Lü Bai-da. Non-paraxial effect of ultrashort pulsed Bessel beams on their propagation[J]. High Power Laser and Particle Beams, 2004, 16(1): 5.
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