  We have developed a light scattering technique based on differential
measurement and polarization (differential light scattering, DLS) capable in
principle of retrieving timing information with picosecond resolution without
the need for fast electronics. DLS was applied to sonoluminescence, duplicating
known results (sharp turnaround, self-similar collapse); the resolution was
limited by intensity noise to about 0.5 ns. Preliminary evidence indicates a
smooth turnaround on a time scale of a few hundred picoseconds, and suggests
the existence of subnanosecond features within a few nanoseconds of the
turnaround.
