Abstract
The relevance of the various dynamical thermal processes which affect the optical properties of a dye solution under flashlamp illumination is examined by means of the appropriate hydrodynamic equations. It is found that the main contribution to the density fluctuations comes from a local Rayleigh term. After a brief discussion of the mechanisms which convert absorbed pump light into heat, the space and time-dependent thermal distortions and the refractive index profiles are evaluated for the case of Rhodamine 6 G in ethanol in a planar geometry. These results yield a basis for a detailed study of the mode behaviour in planar dye lasers. Such an analysis is carried out in the following contribution.
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