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Spatial Beam Shaping-Ultra-short Pulse and Computational Results |
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When an ultra-short pulse passes through a single focusing system, the pulse will be distorted both temporally and spatially. The left plot shows the pulse front of a 10 fs pulse in the focal plane when passing through a focusing lens. The pulse is no longer Gaussian in temporal domain, and diffraction wings appear in the spatial distribution. |
The right figure shows the spatial and temporal intensity distribution of the same pulse passing through the beam shaping system as shown in the previous scheme. The curvature of the pulse front is clearly seen. In the target plane, we can find that the duration time of the pulse increases with increasing radius. |
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In many applications, ultra-short laser pulse is preferred to continuous wave (CW) laser beam because in the Multiple-Pulse Treatment (MPT), it is the duration time of the short single pulses that determines the heat-affected zone as long as the repetition period exceeds significantly the material’s solidification time, while the easily achieved high intensity of each pulse can ensure the required energy in micro-machining treatment.
References:
- S. Y. Zhang, Q. Yang, and G. Lüpke, Spatial beam shaping of ultrashort laser pulses: theory and experiment, Appl. Opt. 44 (27), 2005, pp. 5818-5823.
- S. Y. Zhang, Y. H. Ren, and G. Lüpke, Ultra-Short Laser Pulse Beam Shaping, Appl. Opt. 42 (4), 2003, pp. 715-718.
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Funding: DOE
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