Journal
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
Volume 7, Issue 4, Pages 186-189Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.photonics.2009.03.002
Keywords
Raman lasers; Micro-optics; Aerosols; Droplets; Superhydrophobic surface; Whispering gallery mode
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We demonstrate Raman lasing near 650 nm in pure water microdroplets located on a superhydrophobic surface. In the experiments, stationary, pure water microdroplets were prepared on a superhydrophobic surface and excited by a pulsed, frequency-doubled Nd:YAG laser at 532 nm. Intense laser emission was observed at frequencies corresponding to the whispering gallery mode resonances of the water microdroplets near 650 nm where Raman resonances due to OH-stretching bonds of water are located. On-off behavior was observed during lasing and the average temporal inter-burst separation was determined from the time-dependent intensity traces., Our results can find applications in the development of novel organic light emitters for short-haul communication systems, and in the spectroscopic characterization of water microdroplets on a surface. (C) 2009 Elsevier B.V. All rights reserved.
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