Long-lived conjugate optical echo in a crystal
Akhmediev N. N. , Borisov B. S. , Zultov V. A. , Samartsev V. V. , Stel'makh M. F., Fomichev A. A. , Yakshin M. A.
A long-lived conjugate optical echo has been observed in the LaF3:Pr3+ crystal. The maximum delay at which the optical-echo signal could be detected in these experiments was 5 s.