Ablation of metals by ultrashort laser pulses: theoretical modeling and computer simulations

被引：6

作者：

Afanasiev, YV ^{[1
]}

Chichkov, BN ^{[1
]}

Demchenko, NN ^{[1
]}

Isakov, VA ^{[1
]}

Kanavin, AP ^{[1
]}

Uryupin, SA ^{[1
]}

Zavestovskaya, N ^{[1
]}

机构：

[1] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 117924, Russia

来源：

HIGH-POWER LASER ABLATION II | 2000年 / 3885卷

关键词：

laser ablation; phase transition; thermal mode; ablation by the shock wave; two-temperature model;

D O I：

10.1117/12.376971

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Laser ablation of metals by femto- and picosecond pulses is analytically and numerically studied within the framework of different models for the ablated material. Within the plasma model ablation is initiated by high-power thermal and hydrodynamic waves which propagate into the irradiated material. Analitical expressions for the thermal ablation and for the ablation by the shock wave are obtained. Numerical simulations with the computer code RAPID are in a good agreement with analytical results. Thermal ablation of a metal surface by law-energy ultrashort laser pulses is considered theoretically. The temporal dynamics of the surface electron and lattice temperatures is studied within the framework of the two-temperature model. Analytical expressions for the ablation-threshold fluence as well as the threshold values of the lattice temperature are obtained. This analytical description is in satisfactory agreement with particular numerical calculations. Metal ablation taking into account hydrodynamics of a dense ablated material with ion temperature close to the critical one is considered. The extended two-temperature model taking into account the hydrodynamic plasma expansion, degeneracy of the electron gas, cold pressure of ions and interaction between the electron and ion subsystems (nonideality of the metal plasma) is developed.

引用

页码：266 / 274

页数：9

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