Measurement of the Laser Transition Cross Section forNd+3in Yttrium Aluminum Garnet

摘要: This paper reports measurements of the room-temperature laser transition cross section ${\mathrm{Nd}}^{+3}$ in yttrium aluminum garnet at 1.06 \ensuremath{\mu}. One method used is based on measured upper-state lifetime and a determination fluorescence branching ratio for this state. The value thus determined 3.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$ ${\mathrm{cm}}^{2}$. second involves measurement fluorescent intensities from upper level to ground state lower level, absorption which yields 2.7\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$ difference represents contribution high-lying levels (not included ratio) nonradiative transitions. probable experimental accuracy both methods \ifmmode\pm\else\textpm\fi{}15%.