Journal
OPTICS LETTERS
Volume 41, Issue 24, Pages 5708-5711Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.005708
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- Defense Advanced Research Projects Agency (DARPA) [HR0011-12-2-0007, HR0011-15-C-0056]
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We demonstrate an ultra-compact and low-threshold thulium microcavity laser that is monolithically integrated on a silicon chip. The integrated microlaser consists of an active thulium-doped aluminum oxide microcavity beside a passive silicon nitride bus waveguide, which enables on-chip pump-input and laser-output coupling. We observe lasing in the wavelength range of 1.8-1.9 mu m under 1.6 mu m resonant pumping and at varying waveguide-microcavity gap sizes. The microlaser exhibits a threshold as low as 773 mu W (226 mu W) and a slope efficiency as high as 24% (48%) with respect to the pump power coupled into the silicon nitride bus waveguide (microcavity). Its small footprint, minimal energy consumption, high efficiency, and silicon compatibility demonstrate that on-chip thulium lasers are promising light sources for silicon microphotonic systems. (C) 2016 Optical Society of America
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