Effect of Electromagnetic and Phonon Pulses on a Photon Echo in LaF_3: Pr~(3+)

摘要

The effect of electromagnetic-field pulses of the nanosecond duration on the inverted two-pulse, three-pulse, and long-lived three-pulse photon echoes in LaF3: Pr3+ is studied. The electromagnetic pulses were produced by a current pulse flowing through a thin metal film evaporated on the sample surface parallel to the C3-axis, A strong decrease in echo signals is observed, even if the electromagnetic pulses were switched on prior to laser pulses. The experimental results can be qualitatively interpreted under the assumption that during the flowing of current through the metal film, the generation of transverse acoustic and electromagnetic fields occurs that induces the pseudo-Stark splitting of energy levels of Pr3+ ions and, as a consequence, the decrease in echo signals, if the current was switched on prior to or, correspondingly, at the instant of the action of the laser pulses.