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The GaInAsP microgear laser is a kind of microdisk laser but has a rotationally symmetric grating, which matches with the profile of the whispering gallery mode. In this study, we achieved the room temperature continuous-wave lasing with a threshold photopump power of 14 W for the smallest gear diameter of 2.02 m. We also observed the single-mode lasing in a deep grating device, where the -phase-shifted nonlasing mode completely disappeared. The experimental results were well explained by adoi:10.1109/jstqe.2003.819465 fatcat:lpnbzo637zdi5jsxyxapuqeity