Concentration dependence of photon echo intensity

Alvin D Compaan, L. Q. Lambert, Isaac D. Abella

В. В. Самарцев, R. G. Usmanov

Alvin D Compaan, Isaac D. Abella

We report measurements of direct photon-echo intensity versus Cr concentration which indicate the presence of sizable radiation-damping effects in dark ruby. The departure from ${n}^{2}$ dependence for concentrations above 0.03% Cr demonstrates that modifications of self-induced transparency analyses are necessary in dense resonant media.

В. В. Самарцев, Шегеда Анатолий Михайлович, A. V. Shkalikov +3 more

The results of an experimental investigation of the incoherent photon echo in ruby (with Cr3+ concentration equal to 0.16 wt%) at T=1.7 K are presented. Optical fiber with length 3 m and diameter 100 μm was used for delivery of the first exciting pulse to a sample. The dependence of the IPE intensity on the excitation wavelength within the width of R1 absorption line was studied. The IPE decay curve was obtained and the phase relaxation time was found to be equal to 98 ns.

Felix R. Graf, Alois Renn, G. Zumofen +1 more

We study the photon-echo attenuation by various dynamical processes in rare-earth-ion-doped crystals. The experimental investigations concentrate on a ${\mathrm{Pr}}^{3+}:{\mathrm{Eu}}^{3+}:{\mathrm{Nd}}^{3+}$ codoped ${\mathrm{Y}}_{2}{\mathrm{SiO}}_{5}$ crystal at low temperatures. Two-pulse photon-echo intensities are measured as a function of the pulse intensities when either the ${\mathrm{Pr}}^{3+}$ or the ${\mathrm{Eu}}^{3+}$ ions are excited. For the quantitative interpretation we consider primarily excitation-induced frequency shifts (EFS) by diagonal and off-diagonal interactions and show that for the systems under consideration EFS are dominated by diagonal interactions. The observed echo attenuation by EFS is compared with the predictions calculated from independent Stark-field measurements and reasonable agreement is obtained. The broadening by spin-ion interactions, by nonequilibrium phonons and the dependence of the echo attenuation on the frequency position in the inhomogeneously broadened band are further investigated.

Y.P. Wang, D.M. Boye, John E. Rives +1 more