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:doi:10.3788/COL201917.081405

Chinese Optics Letters, 2019, 17 (8): 081405, Published Online: Jul. 18, 2019

Ultrafast dynamics of three types of simultaneous shockwaves and filament attenuation in femtosecond laser multi-pulse ablation of PMMA Download： 757次

Guoyan Wang ¹Lan Jiang ¹Jingya Sun ¹Jie Hu ^1,*Qingsong Wang ¹Ming Li ²Yongfeng Lu ³

Author Affiliations

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

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

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

Figures & Tables

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

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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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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.

Ultrafast dynamics of three types of simultaneous shockwaves and filament attenuation in femtosecond laser multi-pulse ablation of PMMA Download： 757次

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

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.

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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Ultrafast dynamics of three types of simultaneous shockwaves and filament attenuation in femtosecond laser multi-pulse ablation of PMMA Download： 757次

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

Fig. 4. CSW evolution with pulse number N. All shadowgraphs were captured at the same position with laser fluence of 11.9 J/cm2 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.

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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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.