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Proceedings Paper

Time-resolved femtosecond laser desorption from alkali halide crystals
Author(s): Alan G. Joly; Wayne P. Hess; Kenneth M. Beck
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Paper Abstract

The positive ion yield as a function of delay between ultraviolet femtosecond pulse pairs for four alkali halide single crystals has been measured. Two-pulse correlation allows direct observation of solid state and surface dynamics on an ultrafast timescale. The ion yield from 265 nm irradiated NaBr, KCl, KBr, and KI depends critically on the time delay between the two sub-threshold pulses. Following irradiation of single crystal NaBr and KCl, the positive ion desorption yield displays three distinct features; a coherence peak, followed by rise, and decay features. In contrast, the yield of K+ from KBr displays only the coherence peak and picosecond decay features while the yield from KI shows only the coherence feature. The data suggest that although the nanosecond ion desorption mechanism may be dominated by defect photoabsorption, significant electron-hole pair production may contribute to the desorption mechanism following femtosecond excitation.

Paper Details

Date Published: 20 September 2004
PDF: 6 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.548004
Show Author Affiliations
Alan G. Joly, Pacific Northwest National Lab. (United States)
Wayne P. Hess, Pacific Northwest National Lab. (United States)
Kenneth M. Beck, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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