  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.
