Measurements of spontaneous emission redistribution phosphate glass

R. G. Bikmatov; Alexander V. Charikov; V. M. Chernyak; V. G. Kuznetsov; Michael I. Pergament; Ruslan V. Smirnov; Victor I. Sokolov; John B. Trenholme

doi:10.1117/12.228276

8 December 1995 Measurements of spontaneous emission redistribution phosphate glass

R. G. Bikmatov, Alexander V. Charikov, V. M. Chernyak, V. G. Kuznetsov, Michael I. Pergament, Ruslan V. Smirnov, Victor I. Sokolov, John B. Trenholme

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Proceedings Volume 2633, Solid State Lasers for Application to Inertial Confinement Fusion (ICF); (1995) https://doi.org/10.1117/12.228276
Event: Solid State Lasers for Application to Inertial Confinement Fusion (ICF), 1995, Monterey, CA, United States

Abstract

This report presents results of a study of reabsorbed spontaneous emission (RSE) influence on the spatial inversion distribution in an active medium of large phosphate slab. Experimental results are also presented for a model case of active medium pumping by monopulse second harmonic of Nd-glass laser having specific profile of spatial distribution. RSE is observed for this case. A model is proposed for RSE simulation in solid bodies of arbitrary shape. It is shown that RSE influence is taken into account completely by first approximation, considering the rest fluorescence part of active medium to be an additional source of pump in order to define inversion in the arbitrary point of active medium. Fluorescence kinetics coincides with numerical results of a model experiment. Calculations are carried out of inversion redistribution due to RSE in a large aperture slab of phosphate glass demonstrating that spatial distribution distortions of inversion are small by the moment when inversion maximum is achieved, however, 10 - 12% of stored energy may relate to RSE effect at the absence of amplified spontaneous emission (ASE). Fluorescence kinetics measurements are carried out over slab cross-section demonstrating good agreement with model results.

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R. G. Bikmatov, Alexander V. Charikov, V. M. Chernyak, V. G. Kuznetsov, Michael I. Pergament, Ruslan V. Smirnov, Victor I. Sokolov, and John B. Trenholme "Measurements of spontaneous emission redistribution phosphate glass", Proc. SPIE 2633, Solid State Lasers for Application to Inertial Confinement Fusion (ICF), (8 December 1995); https://doi.org/10.1117/12.228276

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