Photon density oscillations in a resonant medium

Yu. A. Vdovin

A. I. Alekseev, Yu. A. Vdovin, Viktor Mikhaĭlovich Galit︠s︡kiĭ

Oscillations of the photon density in a finite size resonance medium are treated by quantum electrodynamics methods for the case when photon losses can be neglected. The oscillation period and maximum photon density are determined and the effect of narrowing of spectral lines with increasing photon density is explained. A comparison with the experimental data is carried out. (auth)

Mikhail V. Arkhipov, Rostislav M. Arkhipov, Yu. A. Tolmachev

Specific characteristics of the radiation of a resonant medium excited by an ultrashort light pulse propagating through the medium with a superluminal velocity are considered. The medium is assumed to consist of identical linear harmonic oscillators with a spatial density periodically modulated along the direction of propagation of the superluminal excitation. The field of radiation of the resonant medium under these conditions is calculated. It is shown that, under the superluminal excitation, the radiation spectrum of the medium shows, along with the fundamental frequency of the oscillators, new frequencies that depend on the spatial frequency of the distribution of oscillators and on the angle of observation. Possible application of the effect is discussed.

Yu. M. Kirin, Sergey G. Rautian, А. Э. Семенов +1 more

Rostislav M. Arkhipov, Mikhail V. Arkhipov, P. Belov +2 more

We investigate the possibility of controlling the radiation parameters of a spatially periodic one-dimensional medium consisting of classical harmonic oscillators by means of a sequence of ultrashort pulses that propagate through the medium with a superluminal velocity. We show that, in the spectrum of the transient process, in addition to the radiation at a resonant frequency of oscillators, new frequencies arise that depend on the period of the spatial distribution of the oscillator density, the excitation velocity, and the angle of observation. We have examined in detail the case of excitation of the medium by a periodic sequence of ultrashort pulses that travel with a superluminal velocity. We show that it is possible to excite oscillations of complex shapes and to control the radiation parameters of the resonant medium by changing the relationship between the pulse repetition rate, the medium resonant frequency, and the new frequency.

S. T. Gevorkyan, G. Yu. Kryuchkov