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Laser Physics Letters

Full set of relaxation constants for 174 Yb level (6s6p) 3 P 1 in collisions with rare gases

Н. Н. Рубцова, Хворостов Евгений Борисович, Sergei A. Kochubei, Решетов Владимир Александрович

Published Apr 1, 2021• 1 citation
Publisher

Abstract

Abstract For the first time, a complete set of decay parameters, due to collisions of 174 Yb atoms with noble gas atoms and with ytterbium atoms, was experimentally found for the 174 Yb (6s6p) 3 P 1 level. The method of stimulated photon echo with special angles between the polarization vectors of light pulses forming an echo at the 174 Yb (6s 2 ) 1 S 0 —(6s6p) 3 P 1 transition (type 0 ↔ 1 ) is used. For each buffer gas of He, Ne, Ar, Kr, Xe, and Yb, the decay rate constants of population, orientation and alignment for the collision destruction of the 3 P 1 level of 174 Yb atoms are determined. All the decay rates demonstrated their linear increase with a buffer gas pressure, and the corresponding relaxation constants are determined. Each of the indicated relaxation constants, as well as the difference between the alignment and orientation relaxation constants, increases with the increasing buffer gas mass.

DOI
10.1088/1612-202x/abef01

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Journal of Experimental and Theoretical Physics•Oct 1, 2021•4 citations
Abstract For the first time, a complete set of decay parameters, due to collisions of 174 Yb atoms with noble gas atoms and with ytterbium atoms, was experimentally found for the 174 Yb (6s6p) 3 P 1 level. The method of stimulated photon echo with special angles between the polarization vectors of light pulses forming an echo at the 174 Yb (6s 2 ) 1 S 0 —(6s6p) 3 P 1 transition (type 0 ↔ 1 ) is used. For each buffer gas of He, Ne, Ar, Kr, Xe, and Yb, the decay rate constants of population, orientation and alignment for the collision destruction of the 3 P 1 level of 174 Yb atoms are determined. All the decay rates demonstrated their linear increase with a buffer gas pressure, and the corresponding relaxation constants are determined. Each of the indicated relaxation constants, as well as the difference between the alignment and orientation relaxation constants, increases with the increasing buffer gas mass.
Polarization stimulated photon echo technique is applied to measure the difference between relaxation rates of alignment and orientation of the level 3P1 (6s6p) of 174Yb. At the transition 1S0 (6s2) - 3P1 (6s6p) 174Yb (of type 0 ↔ 1) a collision induced echo is revealed, which is generated by two pulses of linear and mutually orthogonal polarizations. Photon echo arises exclusively due to collisions between atoms of ytterbium and buffer gases; its power depends non-monotonously on the buffer pressure, and the echo polarizations coincides with the polarization of the first exciting pulse of radiation.
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.
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.
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.
First proposal is made to measure the ratio of stimulated photon echo power corresponding to two different mutual orientations of exciting pulses polarizations as a function of the buffer gas pressure to extract the spectroscopic information concerning the relaxation rates difference of orientation and alignment from these measurements. The absolute value of the difference between relaxation characteristics |γb (1)-γb (2)| corresponding to orientation and alignment of 3P1 (6s6p) level of 174Yb due to it's collisions with krypton atoms is measured. The fact of the difference between orientation and alignment relaxation rates is reliably stated.