Abstract
The reflection mechanisms are analyzed for the incoherent light beams interacting in a medium with thermal nonlinearity. The propagation geometry of the light beams within a cell with absorbing organic dye is determined, and the intensities of laser radiation associated with the nonlinear reflection effect are estimated. It is demonstrated that on nonlinear reflection one can observe transformation of the spatial structure of a signal beam. The reflected light beam occupies the region associated with the geometric reflection of the signal beam from the reference one. It is found that a thermal lens formed when a laser is operating in the pulsed mode is transformed as a vertical thermal "plate" due to the convection currents of the dye solution.
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