Abstract
Laser-induced damage of fused silica with different parameters was studied by means of photothermal spectroscopy and optical microscope. The development of damage area with laser parameters was discussed, and the photothermal absorption signal and its stability of the damaged pits were studied. It was found that the signal is stronger when the fused silica material was molten or broken. The laser damage area visibility ratio is defined. The change of the laser damage area visibility ratio with laser parameters is studied, and it is suggested that it can be used as a parameter to indicate the degree of damage in engineering.
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