Research on the ablation property of aluminum plate irradiated by quasi-continuous-wave laser and continuous-wave laser

Based on a combination of online experimental system and off-line measuring system, the experiment system of the 1064nm laser irradiating the aluminum plate was established. The laser sources were the quasi-continuous-wave(QCW) laser and the continuous-wave(CW) laser. The average power of the QCW laser was from 100W to 1000W, operating at a repetition rate of 400Hz and pulse duration of 200μs. The QCW laser could be treated as the combination of a high peak short pulse laser with pulse duration of 40μs and a long pulse laser with pulse duration of 160μs, the irradiation effect of the QCW laser was different from the CW laser. The experimental results show that: compared with the CW laser, the QCW laser had a lower ablation threshold and a shorter ablation penetration time; with a same average power, the ablation penetration time was inversely proportional to the beam size, and finally tended to a stable value. In this paper, we also provided the ablation penetration time of other typical targets.