N. C. Griffen
Picosecond Self-Induced Transparency and Photon Echoes in Sodium Vapor
H. M. Gibbs, P. Hu
Excited-State Tri-Level and Two-Photon Echoes in Atomic Sodium Vapor.
THOMAS W. MOSSBERG
Optical Detection of Spin Echoes in Polarized Sodium Vapor
George A. Ruff
Two photon emission in sodium vapor
M. Squicciarini
Six-and eight-photon resonance processes in sodium vapor
Konstantin N. Drabovich, А. И. Ковригин, С. М. Першин +2 more
Two-Photon Optical Pulse Propagation in Sodium Vapor.
Syed Golam Rabbani