Abstract
Hybrid cavities composed of a Fabry-Perot (FP) cavity and awhispering-gallery mode (WGM) microcavity have been proposed anddemonstrated for modulating mode $Q$ factor to realize singlemode and optical bistable lasers. In this article, we report hybrid cavity lasers witha pentagon microcavity and a square microcavity, respectively. Thereflectivity spectra of different microcavities are simulated to selectmicrocavities for hybrid cavities. Mode coupling with mode $Q$ factor enhancement is investigated numerically and experimentally.Stable single mode operations with a high coupling efficiency to a singlemode fiber are realized for a hybrid cavity laser with a square microcavity.Furthermore, optical bistability hybrid lasers are investigated as themicrocavity is unbiased, due to saturable absorption in the microcavity andmode competition, respectively. All-optical flip-flop is demonstrated usingtrigger optical pulses with a width of 100 ps for mode competitionbistability. The stable single mode operation and optical bistability ofhybrid cavity lasers may shed light on the applications for photonicintegrated circuits and optical signal processing.
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