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We report single-shot damage threshold as a function of pulse duration (50-900 fs) for MgF2/ZnS 800-nm omnidirectional-reflection film, interference filter, and gold film. The results indicate that the damage with ultrashort pulse is nonthermal, which is different from that with long pulse. Additionally, the ablation crater depths of 45° 相似文献
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We report on the microstructure formation in Foturan glass,induced by 1 kHz,120 femtosecond laser irradiation.It is found that the line-shaped filamentation,not void array tends to be formed in this glass.This is different from our previous experimental results in fused silica and BK7 glasses.A possible mechanism Ag+ captures the free electrons generated by laser,is proposed to explain the observed phenomena. 相似文献
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We investigate the influence of multiple filamentation (MF) on the micromachining in Ag^+-doped silicate glass irradiated by a l-kHz femtosecond laser. The thresholds of MF and color change (CC) are measured for both linearly and circularly polarized laser beams. The results demonstrate that the thresholds of MF and CC are very close. The thresholds of CC and MF for circular polarization increase by ~1.4 times compared with linear polarization. Circular polarization can suppress the number of filaments to some extent compared with linear polarization. However, it is difficult to obtain CC without any filamentation if circular polarization technique is used alone. 相似文献
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Sub-picosecond chirped laser pulse-induced airflow and water condensation were investigated in a cloud chamber.The results indicate that the positively chirped sub-picosecond laser pulses generate a more uniform intensity distribution inside the plasma column, leading to a weaker airflow and an elliptic-shaped snow pile. The negatively chirped sub-picosecond laser pulses generate a spark-like intensity distribution inside the plasma column, which produces a wider range of airflow and a round snow pile. The amount of snow weight and the concentration of NO_3~- are found to be dependent on the intensity distribution inside the plasma column. The visibly stronger plasma column generates much more snow and a higher concentration of NO_3~-. These experimental results provide a reference for sub-picosecond laser-induced water condensation in realistic atmospheric conditions. 相似文献
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