Study of optical properties of ultrashort-pulse laser-heated material

Hitoki Yoneda; Satoru Ohta; Ken-ichi Ueda; Richard M. More

doi:10.1117/12.486507

19 February 2003 Study of optical properties of ultrashort-pulse laser heated material

Hitoki Yoneda, Satoru Ohta, Ken-ichi Ueda, Richard M. More

Proceedings Volume 4830, Third International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.486507
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan

Abstract

For the purpose pf determining optical properties of high-density plasmas created by ultra-short-pulse lasers, we have measured reflectivity with the pump-probe method. Nominal parameters of pump laser were 248nm, 300fs, and 10¹³~10¹⁴W/cm2 and those of probe beam were 745nm and 120fs. In the case of Al target and a normal incidence probe beam, the reflectivity decreased with time after arrival of the pump pulse. The duration of this change in reflectivity was apparently longer than pulse duration of pump beam at high intensities, while it was almost the same as pulse duration of pump beam for lower irradiance. A change of absorption during the pump pulse and non-linear dependence of resistivity on temperature could not explain these observations. A simple layered structure model was proposed in which heated layer penetrates into cold region with time and interferometric reflection occurs. This model could qualitatively explain the experimental results. Ellipsometric parameters were also measure with a single-shot based four-detector system. There were different time histories observed for the ratios of I(0,0), I(π/2,0) and I(π/4, π/2). This result also implies the plasma has some layered structure.

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Hitoki Yoneda, Satoru Ohta, Ken-ichi Ueda, and Richard M. More "Study of optical properties of ultrashort-pulse laser heated material", Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); https://doi.org/10.1117/12.486507

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KEYWORDS

Reflectivity

Laser beam diagnostics

Aluminum

Plasmas

Optical properties

Data modeling

Solids

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