Fig. 15b illustrates the wavefront profile
for the laser beam propagation in the bubbles. The wavefront profile
is modified intensely by the defects (RMS = 127 nm). A Zernike
decomposition of the wavefront profile allows quantifying optical
aberrations observed after laser propagation in the region contains
bubbles. The bubbles cause significant astigmatism, coma and trefoil
aberrations of the histograms featuring pertinent terms in the
Zernike decomposition (Fig. 15c).