Stimulated-emission cross section and fluorescent quantum efficiency of ${Nd}^{3 +}$ in yttrium aluminum garnet at room temperature

The stimulated-emission cross sections and fluorescence branching ratios for the principal fluorescence transitions of YAG:Nd emanating from the

{}^{4}F_{\frac{3}{2}}

state have been measured at room temperature. The peak cross section of the well-known 1064.2-nm laser line is here found to have a value of 4.6×

10^{- 19}

{cm}^{2}

. Since the cross sections reported here are inconsistent with the generally accepted value of near unity for the radiative quantum efficiency

η

of the

{}^{4}F_{\frac{3}{2}}

state the quantity

η

has been measured directly. A value of 0.56±0.11 is found for

η

which is consistent with the observed fluorescence lifetime of the

{}^{4}F_{\frac{3}{2}}

state and the measured cross sections.

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Stimulated-emission cross section and fluorescent quantum efficiency ofNd3+in yttrium aluminum garnet at room temperature