Cross-relaxation emptying of the ground state of rare-earth ions in crystals
Mikhail A. Noginov, Alexander M. Prokhorov, G. K. Sarkisyan, Vladimir A. Smirnov, Ivan A Shcherbakov
Mikhail A. Noginov, Alexander M. Prokhorov, G. K. Sarkisyan, Vladimir A. Smirnov, Ivan A Shcherbakov