Realizing single-mode lasing in all-inorganic CsPbBr3 perovskite microwires using intrinsic self-absorption

Abstract

Single-mode operation while maintaining a high-quality factor have always been key factors for building high-performance semiconductor lasers. Here, single CsPbBr3 perovskite microwire with a width of ∼3 μm is served as an active microresonator in which a typical single-mode laser output with a quality factor of 3000 is realized through the intrinsic self-absorption effect in success. Simultaneously, we observed the evolution of cavity modes in different dimensional perovskite microresonators and discussed the internal mechanisms of mode evolution and single-mode output in depth. The synergistic effect of intrinsic self-absorption and cavity size is the dominant factor for single-mode lasing output. It provides a feasible approach for the subsequent construction of high-quality electrically pumped single-mode lasers.