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Laser Physics Letters

Kinetics of two-pulsed photon echo formed on the 0–1 transition: isotropic and anisotropic collisions

Гольдорт Вениамин Гершевич, В. Н. Ищенко, Хворостов Евгений Борисович, Sergei A. Kochubei, Н. Н. Рубцова

Published Oct 10, 2018• 0 citations
Publisher

Abstract

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.

DOI
10.1088/1612-202x/aae3a2

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Laser Physics•May 1, 2008•7 citations
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.
Abstract The nonmonotonic kinetics of a collision-induced photon echo has been investigated for a number of buffer atoms. The collision-induced photon echo was generated at the 174Yb (6s2) 1S0 ↔ (6s6p) 3P1 (0 ↔ 1) transition by a pair of linearly and mutually orthogonally polarized resonant radiation pulses in ytterbium vapor and its mixtures with He, Ne, Ar, Kr, and Xe. The kinetics of the conventional photon echo generated by pulses with identical linear polarizations was recorded in the same mixtures. The derived decay rate constants for both types of echo are equal to within the measurement errors. For the collisions of 174Yb atoms between themselves and with other ytterbium isotopes in a natural mixture of isotopes, an upper limit for the anisotropy parameter has been estimated, 0.22 ± 0.07 of the photon echo signal decay rate.
Abstract A collision-induced photon echo (PE) was formed at the 174 Yb (6s 2 ) 1 S 0 —(6s6p) 3 P 1 transition by two resonant radiation pulses polarized linearly and mutually orthogonally. The noble gases He, Ne, Ar, Kr and Xe were used as collision partners for excited 174 Yb atoms. The nonmonotonous decay kinetics of collision-induced PE was detected. The ordinary PE formed by identical linear polarization pulses at the same experimental conditions showed a monotonous decay for the time delays between 80 and 300 ns. The anisotropy parameters for the collisions of 174 Yb atoms with Ne, Ar, Kr and Xe atoms increase with the buffer atom mass and are between 15% and 20% of the corresponding homogeneous line broadening values.
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.
The polarization of the stimulated photon echo (SPE) generated in a gas at the 0↔1 transition was analysed for the first time for all combinations of three linearly polarized resonant radiation exciting pulses. Experimental results were obtained for the SPE generated at the inter-combination transition (6s 2 ) 1 S 0 ↔(6s6p) 3 P 1 of 174 Yb (type 0↔1). In the case where one of the exciting pulses had linear polarization crossed with that of the other two exciting pulses, the SPE polarization proved to be linear and parallel to the crossed pulse polarization. When the second and third exciting pulses had linear polarizations crossed with that of the first one, no SPE in pure ytterbium appeared. For high dilution of ytterbium with the Xe atomic buffer, a collision-induced SPE appeared and showed a non-monotonic amplitude dependence on the buffer pressure and a polarization coinciding with the polarization of the first pulse.
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.