Abstract

We demonstrate prolonged Raman lasing from individual salt-water microdroplets with 1020μm diameters located on a superhydrophobic surface. The mechanism is based on the absorption heating of a 1064nm cw IR laser and the resonant heating of a 532nm pulsed, pump laser. A clear hysteresis is observed in the lasing intensity as the droplet size is photothermally tuned by the IR laser, indicating a self-stabilization mechanism due to the resonant absorption of the pump laser. Using this mechanism, Raman lasing near 650nm is sustained for up to 25 min, ~1000 times longer than lasing durations reported in previous studies.

© 2010 Optical Society of America

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