Dokl. Akad. Nauk SSSR, 1974 Volume 218, Number 2,Pages 316–319(Mi dan38541)
PHYSICS
Investigation of the stimulated radiation of $\mathrm{Lu}_3\mathrm{Ga}_5\mathrm{O}_{12}$
crystals with $\mathrm{Nd}^{3+}$ ions on the $^4F_{3/2}\to^4I_{11/2}$
and $^4F_{3/2}\to^4I_{13/2}$ transitions