| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 744648 | Optics and Lasers in Engineering | 2012 | 5 Pages |
The measurement of the ablation threshold intensity (ATI) is essential for an ultra-fast laser micro-machining process. Unlike the widely used Liu's method, the method presented in this paper investigates the laser Affected Volume and demonstrates that, on some part of the boundary of the affected volume, the laser intensity is equal to the ATI. By defocusing, the size and the shape of the single pulse laser affected volume can be detected to measure the ATI. The potential to setup a standard database of the ATI of various materials by simply calibrating the samples with a benchmark material is also discussed. The method is practically useful as an in situ measurement method in femtosecond pulse laser micro-machining applications.
► In this study, we introduce a method to measure the femtosecond laser ablation threshold intensity. ► We define the laser Affected Volume as the zone in which the laser intensity is over the ablation threshold. ► The size of the affected volume is detected to determine the ablation threshold intensity. ► The experimental result shows that the axial size of the affected volume is much larger than its transverse size. ► The method presented here is different from the conventional method to measure the ablation threshold intensity.
