摘要
We demonstrate an ultra-low-threshold phonon laser using a coupled-microtoroid-cavity system by introducing a novel coupling approach.The scheme exhibits both high optical quality factors and high mechanical quality factors.We have experimentally obtained the mechanical quality factor up to 18,000 in vacuum for a radialbreathing mode of 59.2 MHz.The measured phonon lasing threshold is as low as 1.2μW,which is～5 times lower than the previous result.
We demonstrate an ultra-low-threshold phonon laser using a coupled-microtoroid-cavity system by introducing a novel coupling approach. The scheme exhibits both high optical quality factors and high mechanical quality factors. We have experimentally obtained the mechanical quality factor up to 18,000 in vacuum for a radial-breathing mode of 59.2 MHz. The measured phonon lasing threshold is as low as 1.2 mu W, which is similar to 5 times lower than the previous result. (C) 2017 Chinese Laser Press
基金
National Key Research and Development Program(2016YFA0302500)
National Natural Science Foundation of China(NSFC)(61435007,11574144)
Natural Science Foundation of Jiangsu Province(BK20150015)
Fundamental Research Funds for the Central Universities
