The possibility of selective population of the energy levels of quantum systems was studied using
a single unipolar subcycle pulse and a pair of pulses. Selective population of
quantum levels is clearly illustrated based on the numerical solution of the system of equations
for the density matrix of a three-level medium interacting with a pair of subcycle attosecond and
terahertz pulses. The possibility of creating an population inversion in a three-level medium is shown
using a pair of such pulses. The dynamics of population density gratings in a three-level medium is studied at the impact on the system of a pair of large-amplitude Gaussian pulses. If in a weak field the shape of the gratings is harmonic, according to analytical calculations performed according to perturbation theory, then in in the case of a strong field, the spatial profile of the gratings can differ from the sinusoidal one and has complex spike structure.
Показана возможность создания светоиндуцированных решеток разности заселенностей с помощью пары коротких терагерцовых импульсов для управления терагерцовым излучением. Импульсы когерентно взаимодействуют со средой и не перекрываются в среде. Исследованный эффект открывает новые возможности в терагерцовой спектроскопии с помощью коротких импульсов.
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