Ultrafast dynamics of three types of simultaneous shockwaves and filament attenuation in femtosecond laser multi-pulse ablation of PMMA

Guoyan Wang; Lan Jiang; Jingya Sun; Jie Hu; Qingsong Wang; Ming Li; Yongfeng Lu

doi:10.3788/COL201917.081405

Journals >Chinese Optics Letters >Volume 17 >Issue 8 >Page 081405 > Article

Chinese Optics Letters
Vol. 17, Issue 8, 081405 (2019)

Ultrafast dynamics of three types of simultaneous shockwaves and filament attenuation in femtosecond laser multi-pulse ablation of PMMA

Guoyan Wang¹, Lan Jiang¹, Jingya Sun¹, Jie Hu^1、*, Qingsong Wang¹, Ming Li², and Yongfeng Lu³

Author Affiliations

¹Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

²Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China

³Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0511, USA

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DOI: 10.3788/COL201917.081405 Cite this Article Set citation alerts

Guoyan Wang, Lan Jiang, Jingya Sun, Jie Hu, Qingsong Wang, Ming Li, Yongfeng Lu. Ultrafast dynamics of three types of simultaneous shockwaves and filament attenuation in femtosecond laser multi-pulse ablation of PMMA[J]. Chinese Optics Letters, 2019, 17(8): 081405 Copy Citation Text

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Fig. 1. Sketch of the pump–probe imaging system. BS, beam splitter; M, ultrafast mirror.

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Morphology of three types of shockwaves induced by fs laser single pulse irradiation on PMMA surface with laser fluence of 11.9 J/cm2 at a probe delay of 16 ns. HSW1, HSW2, and CSW are the three types of shockwaves, which represent the HSW in air, the HSW in the sample, and the CSW in the sample, respectively. The solid arrows depict the propagation direction of each shockwave. The dashed line indicates the contour of HSW2.

Fig. 2. Morphology of three types of shockwaves induced by fs laser single pulse irradiation on PMMA surface with laser fluence of

11.9 J / {cm}^{2}

at a probe delay of 16 ns. HSW1, HSW2, and CSW are the three types of shockwaves, which represent the HSW in air, the HSW in the sample, and the CSW in the sample, respectively. The solid arrows depict the propagation direction of each shockwave. The dashed line indicates the contour of HSW2.

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Fig. 3. (a) Propagation distance of HSW1, HSW2, and CSW as a function of probe delay after single pulse irradiation with laser fluence of

11.9 J / {cm}^{2}

. (b) Propagation distance of HSW1, HSW2, and CSW as a function of the pulse number with laser fluence of

11.9 J / {cm}^{2}

; the probe delay of HSW1 and HSW2/CSW is 1 and 16 ns, respectively.

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Fig. 4. CSW evolution with pulse number N. All shadowgraphs were captured at the same position with laser fluence of

11.9 J / {cm}^{2}

at a probe delay of 16 ns. The dashed line represents the surface of the sample and laser propagated from air in the

Z

direction.

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Fig. 5. Schematic diagram of the focal range and FL generation when (a) the first pulse is focused on the flat surface and (b) the subsequent pulse is irradiated on the pre-ablated structure.

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