Fresnel diffraction and small-scale self-focusing of a phase modulated and spectrally dispersed laser beam

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• 作者：Jianqin Deng ; Xiquan Fu ; Lifu Zhang ; Jin Zhang ; Shuangchun Wen
• 关键词：Fresnel diffraction ; Small-scale self-focusing ; Smoothing by spectral dispersion
• 刊名：Optics and Laser Technology
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：45
• 期：Complete
• 页码：56-61
• 全文大小：784 K

文摘

To unravel the propagation properties of the phase modulated and spectrally dispersed (PM-SD) beam in the inertial confinement fusion lasers, we investigated theoretically and numerically the Fresnel diffraction of the PM-SD beam after passing a hard-edged aperture and small-scale self-focusing (SSSF). It is found that the Fresnel diffraction pattern of the PM-SD beam can be significantly changed and the laser beam uniformity can be improved by choosing appropriate PM-SD beam's parameters. The diffraction field of the PM-SD beam has a slower growth than the monochromatic laser beam when the beams suffer from SSSF. The PM-SD beam can be applied to improve the beam uniformity and suppress or delay the onset of SSSF in the high power laser system.