1 May 2015 Focal spot of femtosecond laser pulse under tight focusing condition
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Abstract
A tight focusing scheme using a low f-number focusing optic is frequently considered as an effort to efficiently increase a peak intensity of a high power laser. In this paper, we present a method for describing the focal spot of a femtosecond laser pulse which is formed in the spatio-temporal region under low f-number (f-number ≤ 1) focusing conditions. In the method, transverse and longitudinal electromagnetic (EM) fields for a monochromatic wave are calculated in the focal plane and its vicinity, and then, in order to precisely describe the femtosecond focal spot in the spatio-temporal domain, the calculated monochromatic EM fields are coherently superposed with a given amount of spectral bandwidth and phase. The accuracy and validity of the method are tested and compared to results obtained with Fourier transform method under high f-number conditions. The single electron trajectory under a strong longitudinal field formed by a low f-number optic is presented to emphasize the importance of the tight focusing scheme.
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Tae Moon Jeong, Tae Moon Jeong, Stefan Weber, Stefan Weber, Bruno Le Garrec, Bruno Le Garrec, Daniele Margarone, Daniele Margarone, Tomas Mocek, Tomas Mocek, Georg Korn, Georg Korn, } "Focal spot of femtosecond laser pulse under tight focusing condition", Proc. SPIE 9515, Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers II, 95150I (1 May 2015); doi: 10.1117/12.2179369; https://doi.org/10.1117/12.2179369
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