Author Affiliations
Abstract
Ultrafast Laser Laboratory, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Key Laboratory of Opto-Electronic Information Technical Science, Ministry of Education of China, Tianjin 300072, China
We observe the morphological change and grain structure of Ni foil when it is ablated with femtosecond laser pulses. Scanning electron microscopy and ˉeld emission transmission electron microscopy are used to study the nature of the morphology and grain structure of nickel foil and determine the essential features. The results indicate that there are many random nanostructures in the center of the ablated region composed of nanocrystalline grains as well as some core-shell structures. The observed morphologies seem to suggest that phase explosion and extremely high cooling rate are the most probable physical mechanisms responsible for the formation of surface nanostructures.
激光烧蚀 飞秒激光 金属 表面形貌 140.7090 Ultrafast lasers 140.3390 Laser materials processing 320.7130 Ultrafast processes in condensed matter, including semiconductors 160.3900 Metals Chinese Optics Letters
2010, 8(1): 38
College of Precision Instrument and Opto-electronics Engineering, Key Laboratory of Optoelectronics Information and Technical Science, Tianjin University, Tianjin 300072, China
Frontiers of Optoelectronics
2008, 1(1): 101
本文提出了一种研究超短光脉冲在介质中传输特性的简单的计算机计算方法.用该方法得到了正色散光纤中的频率调制、频谱加宽和方波自成形,以及负色散光纤中的一、二、三阶孤子传输.其数值计算结果与解非线性薛定谔方程的数值结果完全一致.
超短光脉冲 光纤 群速色散 自相位调制
