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Известия Самарского научного центра Российской академии наук

Столкновительное фотонное эхо в магнитном поле

Решетов Владимир Александрович, Е. Н. Попов

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

In this article it was described collision induced photon echo, which is formed by two laser pulses with orthogonal polarizations on the transition with the angular momentum change 0 1. The dependence of the echos intensity versus the ellipticity of laser pulses was found. It was shown that echos intensity has maximum provided that laser pulses are linear and up to zero for circular orthogonal polarization. It was found reduction effect of photon echos signal in longitudinal magnetic field. This effect may be used for measuring the relaxation rates due to such collisions.

Related papers

Collision echo in magnetic field

Решетов Владимир Александрович, Е. Н. Попов, Igor V. Yevseyev

The effects of the longitudinal magnetic field on the collision photon echo, which is formed by two laser pulses with orthogonal polarizations on the transition with the angular momentum change J a = 0 → J b = 1 and arises due to the action of the elastic depolarizing collisions, are studied theoretically. It is shown that weak magnetic field acts to diminish the intensity of the collision echo up to zero, providing the tools for measuring the relaxation rates due to such collisions. With the further increase of the magnetic field strength the echo intensity reveals almost pure harmonic oscillations, though in strong magnetic field the echo appears not due to the action of collisions but mainly due to the action of the magnetic field, so it becomes not collision but conventional photon echo. However the comparison of the amplitudes of the collision echo in zero magnetic field with the maximum echo amplitude in strong magnetic field yields one more way to measure the relaxation rates due to elastic depolarizing collisions.

Laser Physics Letters•Jan 25, 2011•6 citations

Collision-induced stimulated photon echo in magnetic field

Решетов Владимир Александрович

The action of the longitudinal magnetic field on the collision-induced stimulated photon echo formed on the transition with the angular momentum change is studied theoretically. It is shown that this action depends essentially on the sign of the difference in the orientation and alignment relaxation rates of the excited level b. If , then the echo intensity in a weak magnetic field increases with the increase in the magnetic field strength, while in the alternative case it decreases up to zero value. The formulae enabling the determination of the magnitude of the difference from the experimental study of the oscillations of the echo intensity with the increase in the magnetic field strength are obtained.

Laser Physics Letters•Oct 29, 2015•1 citation

Collision-induced stimulated photon echo at the transition 0–1

Решетов Владимир Александрович, Е. Н. Попов

The stimulated photon echo formed by the sequence of three laser excitation pulses in gaseous medium on the transition with the angular momentum change 0-1 is considered with an account of elastic depolarizing collisions. The polarization properties of this echo may be potentially interesting for the purposes of data processing. It is shown, that with the polarization of the first pulse orthogonal to that of the second and third pulses the appearance of the echo signal will be entirely determined by the action of collisions. The existence of this echo is determined by the difference in the alignment and the orientation relaxation rates of the excited level.

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Abstract The collision-induced stimulated photon echo formed on the broad spectral line on the transition with the angular momentum change J a = 0 → J b = 1 is studied theoretically. The dependencies of the echo intensity on the areas of exciting pulses and on the strength of the external magnetic field under the conditions of experiments in ytterbium ( 174 Yb) vapor are obtained. The ways to measure orientation and alignment relaxation rates of the excited atomic level are discussed.

Laser Physics Letters•Nov 30, 2016•4 citations

Collision-induced stimulated photon echoes in ‘strong’ magnetic field

Решетов Владимир Александрович

Abstract Collision-induced stimulated photon echoes formed in a gaseous medium on the transition with the angular momentum change J a = 0 → J b = 1 under the action of ‘strong’ longitudinal magnetic field, when the echo pulse becomes unpolarized, are considered with an account of elastic depolarizing collisions. In the case of narrow spectral line the explicit expressions for the echo polarization density matrix and the degree of polarization are obtained. In the case of broad spectral line the results of the numeric calculations reproduce qualitatively the curve obtained in the experiments with ytterbium vapor.

Laser Physics•Apr 3, 2018•1 citation

Collision-induced photon echo at the transition 0↔1 in ytterbium vapor: Direct proof of depolarizing collision anisotropy

Н. Н. Рубцова, Гольдорт Вениамин Гершевич, В. Н. Ищенко +4 more

A collision-induced photon echo arising at the transition $0\ensuremath{\leftrightarrow}1$ of ytterbium in the presence of heavy atomic buffer is investigated. Collision-induced echo signal appears in the case of mutually orthogonal linear polarizations of exciting pulses and it is absent without buffer. Collision-induced echo power grows with buffer pressure up to the maximum value and decays exponentially at further buffer pressure growth. Collision-induced echo power is essentially less than that of the ordinary echo generated by pulses with parallel polarizations in the same mixture, and its polarization is linear with the polarization vector directed along that of the first exciting pulse. All the properties of collision-induced photon echo are explained on the basis of collision relaxation dependence on the direction of active atom velocity.

Physical Review A•Sep 14, 2011•19 citations
In this article it was described collision induced photon echo, which is formed by two laser pulses with orthogonal polarizations on the transition with the angular momentum change 0 1. The dependence of the echos intensity versus the ellipticity of laser pulses was found. It was shown that echos intensity has maximum provided that laser pulses are linear and up to zero for circular orthogonal polarization. It was found reduction effect of photon echos signal in longitudinal magnetic field. This effect may be used for measuring the relaxation rates due to such collisions.
The effects of the longitudinal magnetic field on the collision photon echo, which is formed by two laser pulses with orthogonal polarizations on the transition with the angular momentum change J a = 0 → J b = 1 and arises due to the action of the elastic depolarizing collisions, are studied theoretically. It is shown that weak magnetic field acts to diminish the intensity of the collision echo up to zero, providing the tools for measuring the relaxation rates due to such collisions. With the further increase of the magnetic field strength the echo intensity reveals almost pure harmonic oscillations, though in strong magnetic field the echo appears not due to the action of collisions but mainly due to the action of the magnetic field, so it becomes not collision but conventional photon echo. However the comparison of the amplitudes of the collision echo in zero magnetic field with the maximum echo amplitude in strong magnetic field yields one more way to measure the relaxation rates due to elastic depolarizing collisions.
The action of the longitudinal magnetic field on the collision-induced stimulated photon echo formed on the transition with the angular momentum change is studied theoretically. It is shown that this action depends essentially on the sign of the difference in the orientation and alignment relaxation rates of the excited level b. If , then the echo intensity in a weak magnetic field increases with the increase in the magnetic field strength, while in the alternative case it decreases up to zero value. The formulae enabling the determination of the magnitude of the difference from the experimental study of the oscillations of the echo intensity with the increase in the magnetic field strength are obtained.
The stimulated photon echo formed by the sequence of three laser excitation pulses in gaseous medium on the transition with the angular momentum change 0-1 is considered with an account of elastic depolarizing collisions. The polarization properties of this echo may be potentially interesting for the purposes of data processing. It is shown, that with the polarization of the first pulse orthogonal to that of the second and third pulses the appearance of the echo signal will be entirely determined by the action of collisions. The existence of this echo is determined by the difference in the alignment and the orientation relaxation rates of the excited level.
Abstract Collision-induced stimulated photon echoes formed in a gaseous medium on the transition with the angular momentum change J a = 0 → J b = 1 under the action of ‘strong’ longitudinal magnetic field, when the echo pulse becomes unpolarized, are considered with an account of elastic depolarizing collisions. In the case of narrow spectral line the explicit expressions for the echo polarization density matrix and the degree of polarization are obtained. In the case of broad spectral line the results of the numeric calculations reproduce qualitatively the curve obtained in the experiments with ytterbium vapor.
A collision-induced photon echo arising at the transition $0\ensuremath{\leftrightarrow}1$ of ytterbium in the presence of heavy atomic buffer is investigated. Collision-induced echo signal appears in the case of mutually orthogonal linear polarizations of exciting pulses and it is absent without buffer. Collision-induced echo power grows with buffer pressure up to the maximum value and decays exponentially at further buffer pressure growth. Collision-induced echo power is essentially less than that of the ordinary echo generated by pulses with parallel polarizations in the same mixture, and its polarization is linear with the polarization vector directed along that of the first exciting pulse. All the properties of collision-induced photon echo are explained on the basis of collision relaxation dependence on the direction of active atom velocity.