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Laser Physics Letters

Collision-induced stimulated photon echo on the broad spectral line

Решетов Владимир Александрович

Published Nov 30, 2016• 4 citations
Publisher

Abstract

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.

DOI
10.1088/1612-202x/14/1/016001

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arXiv:1205.5381•Journal of Physics B Atomic Molecular and Optical Physics•Oct 24, 2012•5 citations
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.
Abstract For the first time, the collision induced stimulated photon echo generated at transition 1 S 0 → 3 P 1 of 174 Yb (type 0–1) in the mixture of gases Yb + Xe was investigated in the presence of weak longitudinal magnetic field, with experimental parameters corresponding to broad spectral line conditions. Comparison of the experimental echo amplitude versus magnetic field strength dependence with the theoretical curve shows a very good agreement, giving rise to an improved estimate for the difference between alignment and orientation decay rates.
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.
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.
Abstract Collision-induced stimulated photon echo generated at transition was analyzed theoretically and investigated experimentally in the gaseous mixture of ytterbium vapour diluted with a large amount of buffer gas xenon in the presence of a weak longitudinal magnetic field. The inter-combination transition of 174 Yb (6s 2 ) 1 S (6s6p) 3 P 1 was used; all experimental parameters were carefully controlled for their correspondence to the broad spectral line conditions. The curve representing the collision-induced stimulated photon echo variations versus a weak magnetic field strength showed very good agreement with the corresponding theoretical curve; this agreement permitted getting the decay rates for 174 Yb level 3 P 1 orientation and alignment in collisions with Xe.
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.