A compact analytic solution describing optoacoustic phenomenon in   absorbing fluid
  Derivation of an analytic, closed-form solution for Q-switched laser induced optoacoustic phenomenon in absorbing fluid media is presented. The solution assumes spherical symmetry as well for the forcing function, which represents heat deposition from Q-switched lasers. The Greens solution provided is a suitable kernel to generate more complex solutions arising in optoacoustics, optoacoustic spectroscopy, photoacoustic and photothermal problems. 
Luisiana Cundin and William Elliott and Norman Barsalou and Shannon   Voss
physics.optics math-ph math.MP physics.flu-dyn