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We investigate the influence of multiple filarnentation (MF) on the micromachining in Ag~+-doped silicateglass irradiated by a 1-kHz femtosecond laser.The thresholds of MF and color change (CC) are measuredfor both linearly and circularly polarized laser beams.The results demonstrate that the thresholds of MFand CC are very close.The thresholds of CC and MF for circular polarization increase by ～1.4 timescompared with linear polarization.Circular polarization can suppress the number of filaments to someextent compared with linear polarization.However,it is difficult to obtain CC without any filarnentationif circular polarization technique is used alone.
We investigate the influence of multiple filarnentation (MF) on the micromachining in Ag ~ + -doped silicateglass irradiated by a 1-kHz femtosecond laser. The thresholds of MF and color change (CC) were measured for both linearly and circularly polarized laser beams. 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 timescompared with linear polarization. Circular polarization can suppress the number of filaments to someextent compared with linear polarization. However, it is difficult to obtain CC without any filarnentationif circular polarization technique is used alone.