Abstract
Small-scale self-focusing (SSSF) causes the distribution of spatial intensity to become asymmetrical. Spatial distribution would generate new growth point during SSSF. We measure the spatial-temporal evolution for ultrashort laser pulse with different truncation parameter of knife-edge during SSSF. Our results show that the new growth point is increasingly far away from center of beam and its intensity increases with decrease of truncation parameter. Meanwhile, the pulse width at the growth point becomes narrower. We find that our experimental results are in good agreement with an approximate theoretical analysis.
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