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Proceedings Paper

The Effect Of Smoothing Of Thermooptical Inhomogeneities (STOI effect) In The Optically Dense Active Media Of The Solid-State Lasers
Author(s): A. A. Danilov; I. A. Scherbakov
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Paper Abstract

A physical nature of smoothing of the thermooptical inhomogeneities (STOI effect) in the active media of solid-state lasers, while increasing absorption of the optical pumping, lies in the suppression of heat-conducting gradients by inhomogeneous pumping energy release. This leads to reduction of thermooptical stresses, provides inhomogeneity for refractive index of the active medium, and decreases laser radiation divergence, thus, making it possible to enhance the average power of generation /1-3/. This effect is more distinct if the optical excitation conditions of the active medium correspond to quasi-grey excita-tion and absorption spectra (optical density should be significantly more than unit), i.e. in the optically dense active media /4/. Later we shall regard the main occurence of the STOI effect in the solid-state lasers with optically dense active media, and present the results of experiments in chromium and neodymium co-doped rare-earth scandium garnets (RESG). In the pulsed solid-state lasers, these media (say, yttrium-scandium-gallium garnet with chromium and neodymium - YSGG:Cr3+, Nd3+ ) agree well with optically dense active medium, especially at high chromium concentration. Moreover, in these lasers the optical density can be varied widely due to a variation of chromium ion concentration, not changing the physics of the active medium from the point of view of spectrally-luminescent characteristics /5/.

Paper Details

Date Published: 24 March 1989
PDF: 6 pages
Proc. SPIE 1021, High Power Solid State Lasers, (24 March 1989); doi: 10.1117/12.950084
Show Author Affiliations
A. A. Danilov, General Physics Institute of the USSR Academy of Sciences (USSR)
I. A. Scherbakov, General Physics Institute of the USSR Academy of Sciences (USSR)

Published in SPIE Proceedings Vol. 1021:
High Power Solid State Lasers
Horst Weber, Editor(s)

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