Abstract
Previous articles suggest the use of a multiply split laser beam moving over the water surface at sonic velocities to create an underwater sound pulse beamed at near horizontal directions. The moving corrugated wavetrain of laser‐induced heating would systematically pump up the acoustic pressure and result in an improved optical‐to‐acoustic transduction efficiency, as well as yielding a controlled sound‐radiation pattern. However, the extended nature of the effective source allows the possibility that gravity waves on the water surface may upset the phase coherence. Considered adverse mechanisms include the following: (1) the refraction of light at the tilted and curved rocking air‐water interface causes the slabs of light penetrating to depths below the surface not to be perfectly parallel; (2) the rippled water surface causes the energy being added to a given moving (nearly planar) region of peak acoustic pressure to fluctuate; and (3) a nearly plane‐acoustic wave propagating horizontally just below the...
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