On Focusing of Broadband Terahertz Pulses


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The particular features of the focusing of a broadband THz pulse with a Gaussian transverse amplitude distribution by a lens are investigated theoretically. The expressions for the spatiotemporal field distribution on the beam axis and in the focal plane of the lens are obtained in the quasi-optical approximation. It is shown that, for the focusing to be efficient, it is necessary to use lenses with a focal distance that is much shorter than the characteristic diffraction length at the frequency corresponding to the spectral maximum of the THz pulse.

作者简介

V. Malevich

B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus

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Email: v.malevich@ifanbel.bas-net.by
白俄罗斯, Minsk, 220072

G. Sinitsyn

B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus

Email: nnrosanov@mail.ru
白俄罗斯, Minsk, 220072

N. Rosanov

Vavilov State Optical Institute; ITMO University; Ioffe Physical Technical Institute, Russian Academy of Sciences

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Email: nnrosanov@mail.ru
俄罗斯联邦, St. Petersburg, 199053; St. Petersburg, 197101; St. Petersburg, 194021

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