Pump-probe imaging of the fs-ps-ns dynamics during femtosecond laser Bessel beam drilling in PMMA

Yanwu Yu, Lan Jiang, Qiang Cao, Bo Xia, Qingsong Wang, Yongfeng Lu

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Abstract

A pump-probe shadowgraph imaging technique was used to reveal the femtosecond-picosecond-nanosecond multitimescale fundamentals of high-quality, high-aspect-ratio (up to 287:1) microhole drilling in poly-methyl-meth-acrylate (PMMA) by a single-shot femtosecond laser Bessel beam. The propagation of Bessel beam in PMMA (at 1.98 × 108 m/s) and it induced cylindrical pressure wave expansion (at 3000-3950 m/s in radius) were observed during drilling processes. Also, it was unexpectedly found that the expansion of the cylindrical pressure wave in PMMA showed a linear relation with time and was insensitive to the laser energy fluctuation, quite different from the case in air. It was assumed that the energy insensitivity was due to the anisotropy of wave expansion in PMMA and the ambient air.

Original languageEnglish (US)
Pages (from-to)32728-32735
Number of pages8
JournalOptics Express
Volume23
Issue number25
DOIs
Publication statusPublished - Dec 14 2015

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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