Recrystallization of germanium surfaces by feratosecond laser pulses

被引：12
作者：
Singh, AP [1 ]
Kapoor, A [1 ]
Tripathi, KN [1 ]
机构：
[1] Univ Delhi, Dept Elect Sci, New Delhi 21, India
来源：
OPTICS AND LASER TECHNOLOGY | 2003年 / 35卷 / 02期
关键词：
recrystallization; germanium surface; femtosecond laser pulses; damage morphology; ripples; grains; linear polarization; circular polarization;
D O I：
10.1016/S0030-3992(02)00146-9
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The damage morphology of germanium surfaces using fermosecond laser pulses of various fluences and number of pulses is reported. The single pulse damage threshold in the present experiment was 9.7 +/- 4.0 x 10(-13) W/cm(2). The experimental threshold value was compared with theory, considering the damage threshold as the melting threshold. The cooling rate calculated on the basis of present results is 2.4 x 10(15) degreesC/s. Recrystallization was the common feature of the damage morphology. For fluences greater than the single pulse damage-threshold micropits and spherical grains of micron size were formed in the damaged surface. Ablation (Surface removal) was also observed at higher fluences (at two or three times of damage threshold value). The damage morphology, induced by multiple pulses, was unaffected for linear and circular polarization. (C) 2002 Elsevier Science Ltd. All rights reserved.
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收藏
页码：87 / 97
页数：11
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