Optical memory based on long-lived photon echo (review)

Optical memory based on the long-lived photon echo and optical superradiance in crystals doped by rare-earth ions

An accumulated long-lived light echo and optical memory

Optical memory based on the long-term photon echo phenomenon

The long-lasting inverted photon echo and optical memory

Access to long-term optical memories using photon echoes retrieved from semiconductor spins

Long-lived photon echo: Graphical method of calculation