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초강력 레이저 과학 연구단
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First-principles simulation of the optical response of bulk and thin-film α-quartz irradiated with an ultrashort intense laser pulse

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Title
First-principles simulation of the optical response of bulk and thin-film α-quartz irradiated with an ultrashort intense laser pulse
Author(s)
Kyung-Min Lee; Chul Min Kim; Shunsuke A. Sato; Tomohito Otobe; Yasushi Shinohara; Kazuhiro Yabana; Tae Moon Jeong
Publication Date
2014-02
Journal
JOURNAL OF APPLIED PHYSICS, v.115, no.5, pp.053519-1 - 053519-8
Publisher
AMER INST PHYSICS
Abstract
A computational method based on a first-principles multiscale simulation has been used for calculating the optical response and the ablation threshold of an optical material irradiated with an ultrashort intense laser pulse. The method employs Maxwell’s equations to describe laser pulse propagation and timedependent density functional theory to describe the generation of conduction band electrons in an optical medium. Optical properties, such as reflectance and absorption, were investigated for laser intensities in the range 1010W/cm2 to 21015W/cm2 based on the theory of generation and spatial distribution of the conduction band electrons. The method was applied to investigate the changes in the optical reflectance of a-quartz bulk, half-wavelength thin-film, and quarter-wavelength thin-film and to estimate their ablation thresholds. Despite the adiabatic local density approximation used in calculating the exchange–correlation potential, the reflectance and the ablation threshold obtained from our method agree well with the previous theoretical and experimental results. The method can be applied to estimate the ablation thresholds for optical materials, in general. The ablation threshold data can be used to design ultra-broadband high-damage-threshold coating structures.
URI
http://pr.ibs.re.kr/handle/8788114/1114
DOI
10.1063/1.4864662
ISSN
0021-8979
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
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