Abstract
The semi-analytical technique for calculating the acoustic response of a femtosecond filament accounting for acoustic attenuation in water and refraction at a plane boundary is proposed. The technique uses the approximation of geometrical acoustics and an analytical solution of wave equation for 2D Gaussian source in lossless medium modified to account for acoustic attenuation. The response calculated using the proposed approximated formulas agrees with the one calculated using k-space pseudospectral method within 1% accuracy and correlates with the waveform obtained in experiments with Cr:Forsterite laser and a wideband lithium niobate piezosensor. The geometrical acoustic approach is used to modify the back-projection algorithm for the corresponding inverse problem of PA tomography. The experimental PA image of a filament is presented.
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