On Focusing of Broadband Terahertz Pulses


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Abstract

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.

About the authors

V. L. Malevich

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

Author for correspondence.
Email: v.malevich@ifanbel.bas-net.by
Belarus, Minsk, 220072

G. V. Sinitsyn

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

Email: nnrosanov@mail.ru
Belarus, Minsk, 220072

N. N. Rosanov

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

Author for correspondence.
Email: nnrosanov@mail.ru
Russian Federation, St. Petersburg, 199053; St. Petersburg, 197101; St. Petersburg, 194021

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