▎ 摘　　要

In this work, we use the variational method to investigate thermal properties and optical absorption of polaron in monolayer graphene under laser field. We have shown that the energies and the optical absorption of the system strongly depend on laser parameters and graphene characteristics. We found that the simple model adopted to calculate the optical absorption is enough accurate and interesting to investigate the optical absorption coefficient of the polarons in graphene. We observe that the laser assists the polaron in the optical absoprtion phenomenon. We observe that temperature, the coupling between electron and quantum of lattice vibration, laser parameters and wave number affect the disorder in the system. Contrary to temperature, the laser increases the disorder in the system. At low temperature, the polaronic system becomes decoherent for low values of wave number and gains coherency for high values of wave number. In addition, the coherence of the system is not significantly affected by the laser field but there is a considerable change at higher temperatures. We also observed that laser increases the capacity of system to store energy.