Journal
CHINESE OPTICS LETTERS
Volume 16, Issue 8, Pages -Publisher
CHINESE LASER PRESS
DOI: 10.3788/COL201816.081401
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Funding
- National Natural Science Foundation of China (NSFC) [61275054]
- Science and Technology Support Program of Jiangsu Province [BE2016177]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
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Microlasers based on high quality (Q) whispering-gallery mode (WGM) resonance are promising low threshold laser sources for bio-sensing and imaging applications. In this Letter, dye-doped polymer microspheres were fabricated by a controlling emulsion solvent evaporation method. WGM lasing with low threshold and high Q factors was realized in an individual microsphere under femtosecond laser pumping. The slight change of environmental relative humidity (RH) can be monitored by measuring the shift of the lasing modes at the exposure of water molecules, which demonstrates the sensitivity is as high as 6 pm/RH%. The results would offer an insight into employing microlasers as sensors.
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