Hybrid Microcavity Lasers: Principle, Design, and Practical Application

Abstract Control coupling and synchronization of lasers has become increasingly attractive for their applications in spectroscopy, imaging, sensing, secret communication, and optical networks. As complex microcavities emerge, more complicated light–matter interactions, along with the resulting distinct lasing emission behavior, is induced in these hybrid microcavities. This review summarizes the most important advances and current deep insights into the inherent relationship between the hybrid microcavity geometries and lasing behaviors, which are classified as the modulated lasing output freedom, including wavelength, angular momentum, mode, direction, and their multiple combinations. Finally, based on scientific research and practical application, the challenges and prospects of future development of hybrid microcavities are proposed, hoping to provide valuable inspiration for further optimizing hybrid microcavities to achieve low thresholds, small divergence angles, and single‐mode microcavity lasers.