Room-temperature measurements of laser emission cross sections of Nd3+ ion in sodium-β" alumina at 1.06 and 1.35 µm as well as the fluorescence branching ratios of 4F3/2 to 4Ij manifolds are reported. A theoretical calculation based on absolute absorption measurements when a modified Judd–Ofelt phenomenological intensity analysis was used is reported. The cross sections thus determined are σ1.06 = 3.1 ± 0.3 × 10-20 cm2 and σ1.35 = 0.6 ± 0.1 × 10-20 cm2, respectively. The emission cross section at 1.06 µm was also determined by small-signal-gain measurements and was found to be in good agreement with the above value.
© 1991 Optical Society of America
H. Dai, O. M. Stafsudd, and B. Dunn, "Measurement of stimulated emission cross section and fluorescence branching ratio for Nd3+ in sodium-β″ alumina," Appl. Opt. 30, 4330-4336 (1991)