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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Polarization properties of photon echo signals in ytterbium vapor: dependence on the area of exciting pulses

Н. Н. Рубцова, A. A. Kovalyov, Хворостов Евгений Борисович, Sergei A. Kochubei, V. L. Kurochkin, L. S. Vasilenko, Igor V. Yevseyev

Published Jan 14, 2000• 0 citations
Publisher

Abstract

A brief review of theoretical predictions for photon echo polarization properties is presented from the viewpoint of their dependence eon the are of exciting pulses and on the contribution of depolarizing collisions. The choice of intercombination transition in ytterbium vapor as subject of investigation is explained. First experimental results on kinetics of resonant fluorescence at the transition of Yb (6s2$0 (superscript 1S0-(6s6p) 3P1 are presented for pure ytterbium vapor and its mixtures with Xe.

DOI
10.1117/12.375310

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Experimental results were obtained at the inter-combination transition (6s 2 ) 1 S 0 ↔ (6s6p) 3 P 1 (type 0 ↔ 1) of 174 Y b vapour for several combinations of linear and circular polarizations of three exciting pulses. A peculiar case appears when the first pulse has linear polarization crossed with the polarizations of the second and third exciting pulses: the stimulated photon echo (SPE) does not appear in pure ytterbium; dilution of ytterbium by Xe implies a collision induced SPE with non-monotonic amplitude dependence on buffer pressure, and with polarization along the first exciting pulse. For circular polarizations, when the first exciting pulse has polarization opposite to the circular polarizations of the second and third pulses, the SPE does not appear either in pure ytterbium vapour or in its mixture with a heavy atomic buffer. SPE polarization dependence on the third exciting pulse area was demonstrated. This result may be of interest for optical data processing. All the results agree with theoretical predictions.

Laser Physics•Mar 18, 2014•5 citations
A brief review of theoretical predictions for photon echo polarization properties is presented from the viewpoint of their dependence eon the are of exciting pulses and on the contribution of depolarizing collisions. The choice of intercombination transition in ytterbium vapor as subject of investigation is explained. First experimental results on kinetics of resonant fluorescence at the transition of Yb (6s2$0 (superscript 1S0-(6s6p) 3P1 are presented for pure ytterbium vapor and its mixtures with Xe.
Collision induced photon echo generated at the inter-combination transition (6s6p) 3P1 ↔ (6s2) 1S0 of 174Yb in the mixture Yb+Xe is investigated. Collision echo is generated by two unidirectional pulses of resonant radiation with linear and mutually orthogonal polarizations. The collision induced echo appears exclusively due to Yb collisions with buffer, and its polarization coincides with polarization of the first exciting pulse. Experimental results are in qualitative agreement with theoretical predictions for anisotropic depolarizing collisions.
Photon echo generated at the inter-combination transition (6s 2) 1 S 0 − (6s6p) 3 P 1 of 174Yb was investigated for pure ytterbium vapor and for its mixtures with atomic buffers. In pure ytterbium vapor, the polarization of photon echoes at this 0–1 transition coincides with the polarization of the second exciting pulse for all combinations of linear and circular polarizations of exciting radiation pulses. Photon echo does not appear either for linear orthogonal or for opposite circular polarizations of exciting pulses in pure ytterbium. In mixtures of ytterbium with atomic buffers (Kr, Xe), collision induced photon echo arises only for exciting pulses of linear orthogonal polarizations, its power is essentially less than that of the ordinary echo generated by pulses with parallel polarizations in the same mixture. Polarization of collision induced echo is linear, and it coincides with polarization of the first exciting pulse. Experimental results agree with calculations, and they confirm that the collision induced photon echo at this transition arises exclusively due to anisotropy of depolarizing collisions.
Isotropic depolarizing collisions are studied using a stimulated photon echo with a specific polarization of the excitation radiation pulses in a mixture of ytterbium with krypton for the J = 1 ⇄ J = 0 transition of 174Yb. The difference between the relaxation rates of orientation and alignment γ (2) − γ (1) of the 3 P 1(6s6p) 174Yb level is measured as a function of the krypton pressure. The collision photon echo at the J = 1 ⇄ J = 0 transition induced by the anisotropic relaxation is studied for the Yb + Xe mixture. The power of the collision echo increases from zero with the addition of a buffer gas to ytterbium, reaches an optimal level, and decreases with an increase in the buffer gas pressure. The polarization of this collision-induced echo differs from the polarization of the conventional echo. The experimental results are in qualitative agreement with theoretical predictions.
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.
Abstract The photon echo formed at the intercombination (6s 2 ) 1 S 0 (6s6p) 3 P 1 (type 0–1) transition of ytterbium atoms 174 Yb by two pulses of resonance radiation was investigated as a function of the time delay between exciting pulses (the photon echo kinetics). For exciting radiation pulses of the same linear polarization in the delay region 70–250 ns, the photon echo kinetics is close to the exponential one both in pure ytterbium and in its mixtures with buffer gases Ar and Xe. The relaxation cross sections were determined for all three cases, taking into account the isotopic composition of xenon and ytterbium. For the first time, the complex nonmonotonous kinetics of the collision-induced photon echo was observed in the same mixtures for the forming pulses of linear mutually orthogonal polarization. The relative efficiency of buffer atoms Yb (other isotopes than 174 Yb), Xe and Ar in the collision-induced photon echo formation was obtained.
Experimental results were obtained at the inter-combination transition (6s 2 ) 1 S 0 ↔ (6s6p) 3 P 1 (type 0 ↔ 1) of 174 Y b vapour for several combinations of linear and circular polarizations of three exciting pulses. A peculiar case appears when the first pulse has linear polarization crossed with the polarizations of the second and third exciting pulses: the stimulated photon echo (SPE) does not appear in pure ytterbium; dilution of ytterbium by Xe implies a collision induced SPE with non-monotonic amplitude dependence on buffer pressure, and with polarization along the first exciting pulse. For circular polarizations, when the first exciting pulse has polarization opposite to the circular polarizations of the second and third pulses, the SPE does not appear either in pure ytterbium vapour or in its mixture with a heavy atomic buffer. SPE polarization dependence on the third exciting pulse area was demonstrated. This result may be of interest for optical data processing. All the results agree with theoretical predictions.