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

被引：32
|
作者：
Yu, Yanwu [1 ]
Jiang, Lan [1 ]
Cao, Qiang [1 ]
Xia, Bo [1 ]
Wang, Qingsong [1 ]
Lu, Yongfeng [2 ]
机构：
[1] Beijing Inst Technol, Sch Mech Engn, Laser Micro Nano Fabricat Lab, Beijing 100081, Peoples R China
[2] Univ Nebraska, Dept Elect Engn, Lincoln, NE 68588 USA
来源：
OPTICS EXPRESS | 2015年 / 23卷 / 25期
基金：
中国国家自然科学基金;
关键词：
ABLATION; PULSE; NANOSECOND; ELECTRON; WATER; FABRICATION; BREAKDOWN;
D O I：
10.1364/OE.23.032728
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 x 10(8) 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. (C) 2015 Optical Society of America
引用
收藏
页码：32728 / 32735
页数：8
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