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Laser damage morphology in fused silica induced by simultaneous multi-wavelength irradiation with multiple longitudinal modes

The influence of multiple longitudinal mode pulses on laser-induced damage at the exit surface of fused silica is investigated under simultaneous exposure to multi-wavelength lasers. The typical damage morphologies are systematically observed after a series of experiments have been conducted on fused silica samples by the equipment for multi-wavelength damage test. By means of the calculation for incubation and expansion fluences determined from the diameter of the ring pattern, the role of the each wavelength laser in damage process has been identified. The results provide insight into the information on the precursor reactiveness under simultaneous exposure to dual-wavelength pulses.