Journal
OPTICS LETTERS
Volume 39, Issue 19, Pages 5614-5617Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.005614
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Funding
- Research Grant Council of Hong Kong [HKU 7112/12E]
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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 similar to 6.6 mu m 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 similar to 9.06 mJ/cm(2), with a quality factor Q of similar to 770 evaluated from the dominant mode at lambda = 430.2 nm, and a free space range (FSR) of 3.17 to 2.16 nm, which is mode-dependent. (C) 2014 Optical Society of America
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