Electromagnetic energy is inevitably given off equally in all directions by each and every sonoluminescence collapse event and this pulsed energy, using currently accepted laboratory method, is dissipated in the liquid but if (hypothetically) we could arrange for a long string or "chain" of such events to be occurring right next to each other all in a "straight" line and all perfectly synchronised, then what?

This might mean that in the line of direction of the synchronous chain of events, photonic and electromagnetic energies could be considered as additive. Moreover, the spacing of the events would represent a wavelength propagating longitudinally throughout the chain and thus a discrete frequency of electromagnetic radiation with a specific vector is implied:-

not that you'd want to look...not that you'd want to look...

-and the light emission could be considered as a kind of laser.

On the other hand...