Abstract
Optically pumped multi-mode whispering-gallery mode (WGM) lasing has been observed in optically free-standing InGaN/GaN quantum well microdisks at room temperature. The optically isolated microdisks are patterned by microsphere lithography on GaN thin-films prepared by laser lift-off of the sapphire substrate, enabling superior optical confinement. The modes are determined to be of second order according to simulations. The lasing threshold is found to be , with a quality factor of evaluated from the dominant mode at , and a free space range (FSR) of 3.17 to 2.16 nm, which is mode-dependent.
© 2014 Optical Society of America
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