Abstract
Stimulated Raman scattering (SRS)1 and coherent Raman mixing (CRM) have bear observed in individual liquid droplets {~30-μm radius) of H2O and ethanol. Their spectra are characterized by (1) spectrally narrow peaks that are regularly spaced in wavelength and (2) a substantially lowered threshold relative to the liquid in an optical cell. Such emission characteristics are a consequence of optical feedback provided by the spherical liquid—air interface at specific wavelengths. The wavelengths at which these morphology-dependent resonances occur can be predicted from the Lorenz-Mie scattering theory for dielectric spheres with large size parameters, x = 2π al λ (where λ is the incident wavelength, and a is the radius).
© 1985 Optical Society of America
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