¹⁷⁴Yb³P₁level relaxation found via weak magnetic field dependence of collision-induced stimulated photon echo

Abstract

Collisioninduced stimulated photon echo generated at transition 0 ↔ 1 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 intercombination transition of 174 Yb (6s 2 ) 1 S 0 ↔(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 collisioninduced 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.

Magnetic field induced rotation of the polarization plane of hydroxyl radical free induction decay in the terahertz region

“…In the time domain, the effect of polarization rotation by paramagnetic particles differs from the usual stationary Faraday effect. This was observed previously in application to the rotation of the photon echo polarization plane [14][15][16][17][18] Under these conditions, the external magnetic field leads to a rotation of the plane of polarization of the FID. The angle of rotation depends on the time elapsed after the excitation pulse and does not depend on the concentration of paramagnetic molecules.…”

Effect of the phase switching of the optical FID in magnetic field

“…The longitudinal magnetic field causes the rotation of the FID polarization plane. This was observed previously in application to the rotation of the photon echo polarization plane [13][14][15][16][17][18]. The angle of rotation depends on the time after the excitation pulse [19,20].…”

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

“…The photon echo signals detected by PMT after analyzer A and the ADC conversion were then stored, averaged and analyzed by using a personal computer PC. The optical scheme of dye lasers L1 and L2 was described in detail in [13] and it included a master oscillator and two amplifying stages. A rough tuning of the radiation frequency of each dye laser to the ytterbium transition under invest igation was accomplished by rotating the diffraction grating of the master oscillator; a more precise and smooth frequency tuning was performed by the nitrogen pressure variation inside the chamber containing the diffraction grating.…”