Terahertz generation from single and multiple filaments in airстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2019 г.
Аннотация:In this paper we present a series of studies for the
control and optimization of THz directionality, polarization
and energy yield.
We observe linear-to-elliptical transformation of
THz radiation through independent control of initially
linear polarization directions of ω and 2ω beams.
Strongly elliptical THz radiation appears abruptly at
the threshold angle of ∼85° between the ω and 2ω
light fields. The physical reason for THz beam ellipticity
was identified by us as the nonlinear response of
the birefringent medium induced by an 800 nm pump.
We found THz ellipticity and energy yield using a
vectorial nonparaxial propagation equation
We have demonstrated and justified the mechanism
which dictates the optimum chirp to maximize
the THz yield from a two-color filament. We have
experimentally measured the THz energy yield using
800-nm pulses in a single filament regime, being
chirped from 35 fs up to 250 fs