Hologram gratings formed by self-induced transparency

Vasiliy V. Shepelevich

L. V. Mizrukhin, Igor I. Peshko, A I Khizhnyak

Theoretical estimates are made which show new possibilities for investigating self-induced transparency (SIT) using a low-intensity probe beam. An analysis is made of a three-level nonlinear medium for which SIT is achieved due to one transition while another transition is used for probing. An important characteristic of the proposed probing system is the use of dynamic holograms utilizing the SIT effect. Some possible applications are discussed.

Ivan P. Kaminow

Rostislav M. Arkhipov, A. V. Pakhomov, Olga Diachkova +2 more

The coherent interaction of extremely short light pulses with a resonant medium can result in the formation of population difference gratings. Such gratings have been created by pulses that are π/2 or smaller. This paper demonstrates that a microcavity with Bragg-like mirrors can be formed by colliding two single-cycle attosecond self-induced transparency pulses in the center of a two-level medium. The parameters of this structure can be quickly adjusted by increasing the number of collisions, which showcases the ability to control the dynamic properties of the medium on a sub-cycle time scale by using attosecond pulses.

Forough Bozorgzadeh, Mostafa Sahrai, Habib Khoshsima

A. M. Smirnov, Anastasiya D. Golinskaya, Kseniia V. Ezhova +2 more

Self-diffraction at a one-dimensional dynamic photonic crystal formed in the colloidal solution of CdSe/ZnS quantum dots has been discovered. This self-diffraction appears simultaneously with self-diffraction at induced transparency channels at the resonant excitation of the main electron–hole (excitonic) transition of quantum dots by two laser beams with a Gaussian intensity distribution over the cross section. It is shown that a nonlinear change in the absorption of colloidal quantum dots results in the formation of a transparency channel and an induced amplitude diffraction grating, and a significant nonlinear change in the refractive index (Δ n ≈ 10 −3 ) in the absorbing medium is responsible for the formation of the dynamic photonic crystal. Self-diffracted laser beams are revealed propagating not only in directions corresponding to self-diffraction at the induced diffraction grating but also in directions satisfying the Laue condition.