SEM-analysis of fracture features formed in excimer-laser induced surface damage of CaF2

被引：14

作者：

Johansen, H ^{[1
]}

Gogoll, S ^{[1
]}

Stenzel, E ^{[1
]}

Reichling, M ^{[1
]}

Matthias, E ^{[1
]}

机构：

[1] FREE UNIV BERLIN, FACHBEREICH PHYS, D-14195 BERLIN, GERMANY

来源：

RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1995年 / 136卷 / 1-4期

关键词：

laser-induced damage; alkaline-earth halides; absorption centres; energy transfer; scanning electron microscopy;

D O I：

10.1080/10420159508218812

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The fracture damage of bulk (111)-CaF2 crystals induced by pulsed irradiation in single shot mode with 248 nn laser light in air is investigated. The irradiated spots are studied with a scanning electron microscope (SEM) using different operational modes. An analysis of the fracture features yields evidence for defect induced absorption, thermal stress and shock wave generation as the main cause of damage. Fracturing is preferentially aligned along the (111)-directions resulting in a triangular shape for the file fragments. The thickness of the fragments shows a clear dependence on incident laser fluence, what can be explained assuming an enhanced surface absorption in the CaF2 crystal.

引用

页码：151 / 156

页数：6

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