Stimulated Photon Echo Induced by Broad-Bandwidth Pulses

Решетов Владимир Александрович

Abstract The collision-induced stimulated photon echo formed on the broad spectral line on the transition with the angular momentum change J a = 0 → J b = 1 is studied theoretically. The dependencies of the echo intensity on the areas of exciting pulses and on the strength of the external magnetic field under the conditions of experiments in ytterbium ( 174 Yb) vapor are obtained. The ways to measure orientation and alignment relaxation rates of the excited atomic level are discussed.

I. V. Evseev, Решетов Владимир Александрович

Решетов Владимир Александрович

Abstract Collision-induced stimulated photon echoes formed in a gaseous medium on the transition with the angular momentum change J a = 0 → J b = 1 under the action of ‘strong’ longitudinal magnetic field, when the echo pulse becomes unpolarized, are considered with an account of elastic depolarizing collisions. In the case of narrow spectral line the explicit expressions for the echo polarization density matrix and the degree of polarization are obtained. In the case of broad spectral line the results of the numeric calculations reproduce qualitatively the curve obtained in the experiments with ytterbium vapor.

L. A. Nefedev, É. I. Khakimzyanova, Guzel I. Garnaeva

I. V. Evseev, V. M. Ermachenko

P. Talagala, S. H. Ling, M. K. Kim

We have observed various types of photon echoes in a rare-earth doped crystal using a broad-band c.w. dye laser. Even at the very low spectral power density of the laser, the quantum efficiency of photon echo generation is as large as those using high-power or narrow-band lasers. We have observed Carr-Purcell type photon echo series for the first time in a rare-earth doped crystal. We have measured relaxation of two-pulse photon echo, three-pulse stimulated photon echo, and many-pulse Carr-Purcell photon echo, and found some new features.