White Beam Lasing from a Hybrid Microcavity with Slab-Capillary Mode Coupling

We report a hybrid multichannel metal-cladded slab-capillary microcavity, which supports simultaneous red, green, and blue lasing from an individual microcavity at room temperature. White and tunable lasing over the full range of visible colors is achieved through controlled injection of different dye solutions into the metal-cladded capillaries of the microcavity. The results show that RGB lasing beams with a line width of approximately 1 nm are observed from the metal-cladded slab-capillary microcavity. The experimental observations show the realization of white light and lasing simultaneously in a single hybrid microcavity. Moreover, the improvement in the laser structure enables the elimination of background noise. Our work describes a simplification in fabricating microlasers with dynamically color-controllable emissions and provides an important route toward the potential of realizing a microlaser device generating both white and full color light directly from a single monolithic structure.