Dual-wavelength single-frequency laser emission in asymmetric coupled microdisks

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Abstract

The gain and loss in a microcavity laser play an important role for the modulation of laser spectrum. We show that dual-wavelength single mode lasing can be achieved in an asymmetric coupled system consisted of two size-mismatched microdisks. The amount of eigenmodes in this coupled-microdisk system is reduced relying on the Vernier effect. Then a single mode is selected to lase by controlling the gain branching in the supermodes. The supermodes are formed by the coupling between different transverse whispering-gallery modes (WGMs). When the gain/loss status between the two mirodisks is changed through selectively pumping process, the modulated gain branching for various supermodes leads to the switchable single-frequency laser emission. The results obtained in this work will provide the further understand for the spectral modulation mechanism in the coupled microcavity laser system.

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Wang, H., Liu, S., Chen, L., Shen, D., & Wu, X. (2016). Dual-wavelength single-frequency laser emission in asymmetric coupled microdisks. Scientific Reports, 6. https://doi.org/10.1038/srep38053

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