Abstract
The relationship between the spectral characteristics of a tunable dye laser and the field structure in a dispersive resonator is investigated. It is demonstrated that nonsymmetrical limiting of the light beam in the dispersive plane of the cavity is responsible for instability of the laser wavelength. Conditions for minimization of the wavelength scatter of an organic dye laser excited by a series of nanosecond pulses are specified. A method of defining the profile of a thermal lens induced by the laser pumping radiation in the active medium is proposed.
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