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Laser Physics

Collision induced two-pulsed photon echo at the transition 0–1 in a weak longitudinal magnetic field

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

Published Oct 29, 2015• 5 citations
Publisher

Abstract

It was shown experimentally in ytterbium vapour at the transition (6s 2 ) 1 S 0 (6s6p) 3 P 1 (type ), that the weak longitudinal magnetic field destroys the collision induced two-pulsed photon echo generated in a gas mixture with heavy atomic buffer; in agreement with theoretical prediction.
DOI
10.1088/1054-660x/25/12/126001

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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.

Laser Physics Letters•Apr 3, 2006•26 citations
Collision-induced photon echo generated in ytterbium vapour at the transition (6s 2 ) 1 S 0 ↔(6s6p) 3 P 1 (transition of the type 0 ↔ 1) was investigated in the presence of the longitudinal magnetic field strength between zero and 5.6 G. For the weak magnetic fields, not over 0.27 G, the collision-induced echo signal decreases with magnetic field increase. Further increase of the magnetic field strength reveals oscillatory behavior of the echo signal. Experimental results are in qualitative agreement with theoretical predictions.
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.
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.
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.