Stimulated emission of impurity molecular crystals in electron-beam pumping

Autor: S. V. Davydov, I. I. Kulak, V. V. Gruzinskii, É. É. Kolesnik
Rok vydání: 1996
Předmět:
Zdroj: Journal of Applied Spectroscopy. 63:237-243
ISSN: 1573-8647
0021-9037
Popis: Stimulated emission in impurity organic crystals in pumping by a beam of high-energy electrons was obtained for the first time in 11 1. Analysis of the experimental data [1-41 shows that the effects of spectral narrowing and contraction of the duration of radiation pulses on an increase in the power density of electronic pumping are by no means observed for all impurity crystals and, besides, the production of stimulated emission requires the use of crystals with a high (- 1 wt. %) activator concentration and rather large pumping power densities (of order tens of MW/cm2). Therefore, of current interest is the search for the impurity organic crystals that would hold the greatest promise from the viewpoint of the possible attainment of laser action in pumping by an electron beam and optimization of the conditions for developing stimulated emission. In the present work a mathematical model is developed that describes the processes of the transformation of the energy of electrons injected into a crystal into light energy and of the development of stimulated emission. We set up and adjusted an algorithm for numerical calculation of the concentrations of the matrix and impurity molecules in different excited states, as well as the spectral, kinetic, and energy characteristics of the radiation of crystals in the regime of one-pass superluminescence and in the presence of positive feedback due to Fresnel reflection by crystal end faces. The calculated relations for the radiative parameters are compared with experimental data for a naphthalene crystal with a flfl-dinaphthytethylene impurity [ 1, 21.
Databáze: OpenAIRE
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