Abstract
AbstractThe conditions and peculiarities of the photon echo forming in monocrystals of LiAl5O8:Cr3+ and CaWO4: Nd3+ are experimentally investigated. The photon echo phenomenon for LiAl5O8:Cr3+ crystals is firstly discovered. A value for the transversal nonreversible relaxation time T2 of about 37 ns is found from the experimental dependence of the echo intensity on the time between the pulses. The dependence of the photon echo intensity on a stationary magnetic field is also investigated. When observing the photon echo in CaWO4:Nd3+, the resonance conditions are achieved with the help of a dye laser. A theory of the optical coherent response is developed for both the cases of Δt > T and of Δt < T (Δt pulse duration, T time of the transverse reversible relaxation). Satisfactory agreement of the experimental and theoretical results is found.
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