ABSTRACT
A multiple graphene layer (MGL) structure with a stack of graphene layers (GLs) and a highly conducting bottom graphene layer on SiC substrate pumped by optical radiation is considered as an active region of terahertz and far infrared lasers with external metal mirrors. In this chapter, the authors analyze the operation of terahertz lasers utilizing optically pumped MGL structures by calculating their characteristics as function of the number of graphene layers and optical pumping intensity and demonstrate the feasibility of realization of such lasers operating at the frequencies from about 1 Terahertz to several terahertz at room temperatures. They consider a laser structure with an MGL structure on a SiC substrate serving as its active region. Although the active media under consideration can be supplemented by different resonant cavities, for definiteness the authors address the MGL structure placed between the highly reflecting metal mirrors.
