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Proceedings Paper

Tightly-focused femtosecond laser interaction with water
Author(s): Koji Hatanaka
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Paper Abstract

Tightly-focused femtosecond laser pulse (<35fs, 800nm) irradiation up to sub-peta-W/cm2 at the focus onto thin water flow (10-15μm thick) in air results in plasma formation associated with dynamic and macroscopic laser ablation phenomena. Under such experimental conditions, hard X-ray, THz wave, and sound/ultrasound emission were measured with a Geiger counter, time-domain spectroscopy with a ZnTe(110) crystal (1mm-thick) based on electro-optical sampling method, and microphone/transducer, simultaneously. Under the single pulse irradiation, intensities of X-ray, THz wave, and sound show their maxima at the same position of the water flow along the laser irradiation axis (Z-axis), while the width of the intensity profile along the Z-axis is narrower at 44μm in X-ray than that of THz wave at 225μm and sound (10Hz-20kHz) at 400μm when the laser intensity is at 0.4mJ/pulse and focused by an off-axis parabolic mirror (f = 5cm). Under the double pulse irradiation conditions with the time delay between the main pulse (p-pol.) and the prepulse (s-pol.) up to 15ns, those emissions are enhanced, which can be ascribed to time-dependent various phenomena of laser ablation such as pre-plasma formation and transient surface modifications induced by the pre-pulse irradiation.

Paper Details

Date Published: 31 December 2019
PDF: 2 pages
Proc. SPIE 11201, SPIE Micro + Nano Materials, Devices, and Applications 2019, 112010U (31 December 2019); doi: 10.1117/12.2541212
Show Author Affiliations
Koji Hatanaka, Academia Sinica (Taiwan)
Chang Gung Univ. (Taiwan)
National Dong-Hwa Univ. (Taiwan)

Published in SPIE Proceedings Vol. 11201:
SPIE Micro + Nano Materials, Devices, and Applications 2019
M. Cather Simpson; Saulius Juodkazis, Editor(s)

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