Numerical calculation of nonlinear ultrashort laser pulse propagation in water

被引：1
|
作者：
Arnold, CL [1 ]
Heisterkamp, A [1 ]
Ertmer, W [1 ]
Lubatschowski, H [1 ]
机构：
[1] Laser Zentrum Hannover eV, D-30419 Hannover, Germany
来源：
COMMERCIAL AND BIOMEDICAL APPLICATIONS OF ULTRAFAST LASERS IV | 2004年 / 5340卷
关键词：
ultrashort laser pulses; optical breakdown; nonlinear pulse propagation; ophthalmology;
D O I：
10.1117/12.529003
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
T hen ultrashort laser pulses are focused inside transparent materials, extremely high field intensities can easily be achieved in the focal volume leading to nonlinear interaction with the material. In corneal tissue this nonlinear interaction results in an optical breakdown that may serve as a cutting mechanism in ophthalmology. As a side effect of optical breakdown in corneal tissue, streak-like structures have been observed as discoloration in histological sections under a light microscope. To investigate the streak formation, a numerical model including nonlinear pulse propagation due to self-focusing, group velocity dispersion. and plasma defocusing due to generated free electrons is presented. The model consists of a (3+1)-dimensional nonlinear Schrodinger equation, describing the pulse propagation coupled to an evolution equation covering the generation of free electrons. The rate equation contains multi photon ionization as well as avalanche ionization. The model is applicable to any transparent Kerr-medium.
引用
收藏
页码：47 / 54
页数：8
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