Time-resolved femtosecond laser desorption from alkali halide crystals

Alan G. Joly; Wayne P. Hess; Kenneth M. Beck

doi:10.1117/12.548004

20 September 2004 Time-resolved femtosecond laser desorption from alkali halide crystals

Alan G. Joly, Wayne P. Hess, Kenneth M. Beck

Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.548004
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States

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.

Citation Download Citation

Alan G. Joly, Wayne P. Hess, and Kenneth M. Beck "Time-resolved femtosecond laser desorption from alkali halide crystals", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); https://doi.org/10.1117/12.548004

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