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Journal of Physics Conference Series

Interplay of light and collisions in photon echo formation

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

Published Feb 8, 2013• 0 citations
Publisher

Abstract

Situations when a set of resonant radiation pulses can not create photon echo (PE) or stimulated photon echo (SPE) at relatively simple optically allowed transition in a gas are investigated. Some cases when dilution by atomic buffer can imply PE or SPE generation are analyzed. Discovered experimentally mechanisms, amplitudes, and polarization properties of these collision induced PE and collision induced SPE are in agreement with theoretical predictions. Dynamic Stark suppression of photon echo is also studied.

DOI
10.1088/1742-6596/414/1/012004

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Situations when a set of resonant radiation pulses can not create photon echo (PE) or stimulated photon echo (SPE) at relatively simple optically allowed transition in a gas are investigated. Some cases when dilution by atomic buffer can imply PE or SPE generation are analyzed. Discovered experimentally mechanisms, amplitudes, and polarization properties of these collision induced PE and collision induced SPE are in agreement with theoretical predictions. Dynamic Stark suppression of photon echo is also studied.
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.
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.
Collision induced photon echo is observed in ytterbium vapour at the inter-combination transition (6s6p) 3P1 ↔ (6s2) 1S0 in the presence of Kr gas as buffer. Collision echo is generated by two unidirectional resonant dye laser pulses of linear mutually orthogonal polarizations. There is practically no echo in the absence of buffer. Photon echo power increases with Kr pressure in the range from 0 to 20 mTorr and decreases at higher Kr pressures. Experimental results are compared with theoretical predictions accounting for relaxation matrix dependence on the direction of the velocity of active atoms.
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.