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Proceedings Paper

Femtosecond laser induced ablation dynamics probing by emission and scattering spectroscopy under various vacuum conditions
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Paper Abstract

To examine the ablation dynamics of silver thin films by femtosecond laser, we experimentally investigate the plume evolution and behavior of ejected nanoparticles (NPs) via emission and scattering spectroscopy measurements under background pressures of 760 torr, 5 torr, 5 x 10-3 torr, to 3 x 10-5 torr. The emission spectroscopy experiments show that the propagation of the ablated plume is affected by ambient pressure. The higher the pressure, the more the propagation of the plasma is suppressed. Under higher vacuum, the lifetime of plasma is shorter due to diminished collisions with background molecules. The evolution of plasma lasts more than 200 ns under 760 torr while it does not exceed 200 ns under high vacuum (3 x 10-5 torr). Through the scattering measurements, the average propagation speed of NPs is 200 m/s under 3 x 10-5 torr, 190 m/s under 5 x 10-3 torr, 155 m/s under 5 torr, and 120 m/s under 760 torr. The ejected nanoparticles from the periphery of the ablated spot exhibit oblique trajectories because of the exerted recoil pressure at the spot center region that is subject to high incident energy densities.

Paper Details

Date Published: 2 March 2020
PDF: 6 pages
Proc. SPIE 11268, Laser-based Micro- and Nanoprocessing XIV, 112680E (2 March 2020); doi: 10.1117/12.2545399
Show Author Affiliations
Jinhong Jeun, Samsung Display Co., Ltd. (Korea, Republic of)
Univ. of California, Berkeley (United States)
Minok Park, Univ. of California, Berkeley (United States)
Gyoowan Han, Samsung Display Co., Ltd. (Korea, Republic of)
Seongho Jeong, Samsung Display Co., Ltd. (Korea, Republic of)
Cheollae Roh, Samsung Display Co., Ltd. (Korea, Republic of)
Costas P. Grigoropoulos, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 11268:
Laser-based Micro- and Nanoprocessing XIV
Udo Klotzbach; Akira Watanabe; Rainer Kling, Editor(s)

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