Different Temporal Behavior for the Forward- and Backward-Circulating RadiationWithin a Microdroplet

摘要

Spatially resolved nonlinear scattering of a train of picosecond pulses fromethanol microdroplets is investigated. Different time behavior is observed for light with the same and the opposite sense of circulation as the input-coupled light. The forward circulating light exhibits a smooth, delayed pulse to pulse growth, attributed to increased input coupling with time induced by the laser pulses. The backward circulating light has an irregular time behavior, attributed to near backward stimulated Brillouin scattering. Increased scattering as a result of CO2 (compared with He) dissolved gas is demonstrated by an intensity decrease of the spatially precessed radiation on a cavity resonance.