Abstract
Laser-induced damage on fused silica is studied with photo-acoustic spectrum. The damage characteristics are evaluated with the spectral analysis of photo-acoustic signal. The experimental results show that the damage threshold of fused silica samples is about 20.9 J/cm2 at 1-ON-1 condition at the wavelength of 1064 nm and the pulse duration of 10 ns. The damage morphology observed with confocal microscopy is gray haze, and the diameter and depth of the largest crater in gray haze are $6.7~\mu \text{m}$ and 200 nm, respectively. The reproducibility of photo-acoustic spectrum analysis and the characteristic spectral peak is discussed. Compared to the photo-acoustic method judged by signal amplitude, the photo-acoustic spectrum is more sensitive, which may provide an effective support for the study on laser-generated thermal explosion and shock wave propagation. Moreover, the photo-acoustic spectrum may provide a clue for early-damage judgment.
Published Version
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