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We study the characteristics of photogenerated electron-hole plasma inoptically pumped graphene layers at elevated (room) temperatures when theinterband and intraband processes of emission and absorption of optical phononsplay a crucial role. The electron-hole plasma heating and cooling as well asthe effect of nonequilibrium optical phonons are taken into account. % Thedependences of the quasi-Fermi energy and effective temperature of opticallypumped graphene layers on the intensity of pumping radiation are calculated.The variation of the frequency dependences dynamic conductivity with increasingpumping intensity as well as the conditions when this conductivity becomesnegative in a certain range of frequencies are considered. %  The effects under consideration can markedly influence the achievement of thenegative dynamic conductivity in optically pumped graphene layers associatedwith the population inversion and, hence, the realization graphene-basedterahertz and infrared lasers operating at room temperatures.

Effect of heating and cooling of photogenerated electron-hole plasma in optically pumped graphene on population inversion