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Laser Physics

Photon echo generated at the transition 0–1 in ytterbium vapor

Н. Н. Рубцова, Гольдорт Вениамин Гершевич, В. Н. Ищенко, Sergei A. Kochubei, Хворостов Евгений Борисович, Решетов Владимир Александрович, Igor V. Yevseyev

Published Sep 3, 2012• 0 citations
Publisher

Abstract

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.

DOI
10.1134/s1054660x12100210

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Laser Physics•Feb 1, 2009•9 citations
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.
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.
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.
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.
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.
For the first time, stimulated photon echoes (SPE) generated in a gas at the transition 0↔1 by circularly polarized resonant radiation pulses were analysed both theoretically and experimentally. Experiments were performed for the inter-combination transition (6s2) 1S0↔ (6s6p) 3P1 of 174Yb (type 0↔1). The SPE generated by three radiation pulses of identical circular polarizations has the same circular polarization. When the second or the third exciting radiation pulse has a circular polarization opposite to that of the other two pulses, the SPE polarization coincides with that of the oppositely polarized pulse. Finally, when the first exciting radiation pulse has a circular polarization opposite to the circular polarizations of the second pulse and third pulse, the SPE does not appear either in pure ytterbium vapour or in its mixture with a heavy atomic buffer.
The polarization properties of the photon echo generated by two linearly polarized pulses of resonant radiation at the (6s6p)3 P 1 ↔ (6s 2)1 S 0 transition of 174Yb are investigated. A complicated polarization behavior of the photon echo versus an angle between the polarization vectors of the excitation pulses is revealed in a mixture of ytterbium vapor with inert gas. For the angles ranging from 0° to 75°, a conventional echo with its linear polarization coinciding with the second excitation pulse dominates and the echo amplitude decreases with an increasing angle. For the angles ranging from 75° to 89°, the photon echo is elliptically polarized. Finally, for an angle of 90°, the conventional echo disappears and the collision echo becomes linearly polarized along the first excitation pulse.