Luminescence Beats Induced by Pulse Excitation of Coherent States

Evgenii B. Aleksandrov

Evgenii B. Aleksandrov

T. Hadeishi, William A. Nierenberg

В. Смирнов, Г. М. Ермолаева, В. Б. Шилов

A new theoretical model describing the emission and absorption dynamics in an ensemble of molecules under intense coherent pulsed pumping is developed on the basis of the concepts of cooperative light-induced luminescence (CLIL). The CLIL development is described within the framework of formalism of the system density matrix in the space of photon wave functions. It is shown that the fast growth of CLIL relates to the development of coherent states of the quantum field in the area of efficient cooperative interactions of molecules (coherence volume). A system of equations for the calculation of CLIL energy, population of excited states, and optical absorption of the system in dependence on the laser pump energy density is solved. The theoretical results obtained are in good agreement with the experimental data.

Hiroki Nakatsuka, Jumpei Okada, Masahiro Matsuoka

Free precession beat of two-photon induced coherence was observed by the use of delayed probe pulses in atomic rubidium vapor. The two-photon coherence was created in the superposition state of the 5S 1/2 and 5D 5/2 levels of Rb by two-photon resonant excitation with a mode-locked dye laser pulse. The origin of the beat is attributed to the hyperfine splittings of the 5S 1/2 ground state of both Rb 85 and Rb 87 . The observed results are explained by a theory presented in this paper.

F. A. Popp, Y. Yan