Relaxation Phenomena in Electronic and Lattice Subsystems on Iron Surface during Its Ablation by Ultrashort Laser Pulses

被引：47

作者：

Artyukov, I. A. ^{[1
]}

Zayarniy, D. A. ^{[1
]}

Ionin, A. A. ^{[1
]}

Kudryashov, S. I. ^{[1
]}

Makarov, S. V. ^{[1
]}

Saltuganov, P. N. ^{[1
]}

机构：

[1] Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia

来源：

JETP LETTERS | 2014年 / 99卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

FEMTOSECOND OPTICAL-BREAKDOWN; DIELECTRICS; NANOSECOND; DYNAMICS; DAMAGE; FS;

D O I：

10.1134/S0021364014010020

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Single-shot ablative spallation and fragmentation thresholds, as well as corresponding ablative crater depths, were measured on the surface of iron using optical interferometry, for different ultrashort laser pulse widths in the range tau(las) = 0.3-3.6 ps. The nonmonotonic dependence of these thresholds on tau(las) with the minimum near 1.2 ps (the characteristic electron-phonon relaxation time tau(ep)) represents transport and emission relaxation phenomena for nonthermalized and thermalized carriers, generated by sub-and picosecond laser pulses, respectively. Compared to rather slow spallative ablation, much faster-picosecond-fragmentation ablation of the iron surface through hydrodynamic expansion of its supercritical fluid ceased for tau(las) > tau(ep) as a result of evaporative cooling.

引用

页码：51 / 55

页数：5

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