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Proceedings Paper

Time resolved optical methods for investigation of phase transformations in materials exposed to nanosecond laser pulses
Author(s): J. Martan; N. Semmar; O. Cibulka
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Paper Abstract

Infrared (IR) radiometry and time resolved reflectivity (TRR) methods can be used for investigation of laser pulse effects on materials in nanosecond time scale. The methods in combination are capable to quantify object temperature and detect phase transformations in the solid state, melting and plasma formation from vapour. Measurements with different laser pulse energy densities provide threshold of the transformation. The melt duration can be also determined. The experimental system is described. It contains KrF excimer laser with homogenizer and variable attenuator, fast IR detector for radiometry, continuous probing laser with Si photodiode for reflectivity measurement and UV detector for pump laser pulse reflection measurement. The system was applied to investigation of responses to laser light of silicon and different pure metals and alloys. The range of energy densities used was 1-5500 and measurements were done with temporal resolution of 6 ns for radiometry and 1 ns for reflectivity.

Paper Details

Date Published: 18 May 2011
PDF: 15 pages
Proc. SPIE 8077, Damage to VUV, EUV, and X-ray Optics III, 80770D (18 May 2011); doi: 10.1117/12.887581
Show Author Affiliations
J. Martan, Univ. of West Bohemia (Czech Republic)
GREMI, CNRS, Univ. d'Orléans (France)
N. Semmar, GREMI, CNRS, Univ. d'Orléans (France)
O. Cibulka, Univ. of West Bohemia (Czech Republic)

Published in SPIE Proceedings Vol. 8077:
Damage to VUV, EUV, and X-ray Optics III
Libor Juha; Saša Bajt; Richard A. London, Editor(s)

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