基于有机异质耦合微腔的双波长可切换单模激光

Micro/nanoscale lasers have attracted great interest because of their promising applications ranging from ultrasensitive chemical and biological sensing to optical information processing. Due to the inhomogeneous gain saturation introduced by spatial hole burning, most micro/nanoscale lasers are subject to operation in multimodes, which will lead to temporal fluctuations and false signaling. As a result, the practical applications of lasers are restricted. Single-mode lasers can effectively solve these problems. Currently, most of the single-mode laser modulation strategies require precisely processing the microstructures. However, it is still a great challenge to realize dynamically switchable multicolor single-mode laser output in the same device. In this work, we fabricated organic microcavities doped with different gain media using inkjet-printing method. Controlling the coupling strength of the heterogeneously coupled microcavity is achieved by controlling the stretching degree of the flexible substrate, through which a wavelength-switchable dual-wavelength single-mode laser emission is realized. These results deepen the understanding of the lasing modulation mechanism in heterogeneously coupled cavity systems and offer a route to build multifunctional and miniaturized lasers for photonic integrations.