论文类型：期刊论文
发表刊物：Optics Express
收录刊物：SCI
关键字：Ultrafast lasers;
DOI码：10.1364/OE.449608
发表时间：2022-03-03
摘要：By studying the nonlinear absorption of ultrafast laser pulses in fused silica, we examine, both with experiments and numerical simulations, the different polarization dependence of multiphoton ionization and avalanche ionization. Results show multiphoton ionization and avalanche ionization play different roles in femtosecond and picosecond laser micromachining, and the contribution via avalanche ionization increases with pulse duration. Meanwhile, the spatial distribution of the free carriers generated by circularly polarized pulses is more concentrated than those generated by linear polarization for picosecond laser pulses. These properties make the circular polarized ultrafast laser a possible way to improve the ultrafast laser micromachining efficiency and spatial quality, and can help to reduce some problematic nonlinear effects in ultrafast laser micromachining of low energy band materials.
发布期刊链接：https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-6-8949