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Mechanism of vibronic amplification of transport of excitons was discussed inrelation to quantum photosynthesis. Vibrones (some modes of vibrations ofmolecules) are observed experimentally in photosynthetic systems. In thepresent paper we discuss a model of vibronic amplification of quantum transferwhere generation of vibrones as a coherent vibrational mode is described by ananalog of semiclassical theory of laser. We consider two models --- a model ofnonequilibrium three level system with vibronic mode, and some variant of amodel of laser without inversion. We conjecture that dark states discussed inrelation to quantum photosynthesis might be related to mechanism of vibronic"laser" without inversion which amplifies the transfer of excitons. We provethat in presence of vibronic mode transfer rate of excitons increases andcompute dependence of the transfer rate on parameters of the model.

Model of vibrones in quantum photosynthesis as an analog of model of laser