Vm. Akulin et al., OPTICAL 2ND-HARMONIC GENERATION FOR SIZE MEASUREMENT OF SMALL SPHERICAL CLUSTERS, Physical review letters, 73(9), 1994, pp. 1231-1234
A new physical effect, the optical second harmonic generation in the c
ombinational process involving a capillary wave excitation, suggests a
new diagnostics for the size distribution and temperature of liquid s
pherical clusters or droplets smaller than the wavelength of light.