Photon-echo (PE) measurements has been performed in (gamma) - irradiated ruby and in external constant electric field.There are considered the factors which determine the echo envelope decay of primary and backward PE echo for large samples of ruby. The data of PE for ruby of transitions with nucleus spin I equals 3/2 are presented. This sample is a perspective object for searching long-lived PE.
Ramil G. Usmanov,
Nikolay A. Chitalin,
"Particularities of photon echo in a ruby", Proc. SPIE 4061, IRQO '99: Quantum Optics, (14 January 2000); doi: 10.1117/12.375314; https://doi.org/10.1117/12.375314