Birth, evolution and annihilation of phase singularities in the propagation of a laser beam passed through a self-focusing strontium barium niobate crystal

被引:29
作者
Ilyenkov, AV
Kreminskaya, LV
Soskin, MS
Vasnetsov, MV
机构
[1] Institute of Physics, Natl. Academy of Sciences of Ukraine, Kiev-22, 252650
来源
JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS | 1997年 / 6卷 / 02期
关键词
D O I
10.1142/S0218863597000150
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report the first observations and the mechanism of natural nucleation, propagation and annihilation of optical vortices in a laser beam with initially smooth Gaussian wave front passed through self-focusing photorefractive strontium barium niobate crystal. Wave-front distortions due to the formation of thermal-induced nonlinear lens lead to the origin of phase singularities. Pairs of opposite topological charge screw wave-front dislocations nucleate and annihilate through a formation of limited edge dislocations. In a free-space propagation the alternating sign vortices array nested in the beam has the form of quadruple.
引用
收藏
页码:169 / 180
页数:12
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