COOPERATIVE - RADIATION DYNAMICS IN ^l30Te₂ AND ¹²⁵Te₂

Abstract
We present new results on Te₂ superfluorescence induced by short YAG-pumped dye laser pulses analyzed at high resolution by comparison with C.W. laser induced fluorescence observed by Fourier transform spectroscopy. A complete identification of the transitions involved based on intensity measurements and supported by calculated Franck-Condon factors has been achieved. The cooperative emission in Te₂ has been studied by time resolved spectroscopy as a function of density. As the density or temperature of the sample is increased, the emission evolves continuously from characteristic spontaneous emission to superfluorescence. The dependence of the superradiant pulse parameters (relaxation time and half-width) with respect to density will be presented and compared to predictions of current theories.