Laser-induced pattern formation from homogeneous polyisoprene solutions
Lin Dian-Yang(林殿阳)a)†, Li Ming(黎明)a)b), Wang Shu-Jie(王淑杰)c), and Lü Zhi-Wei(吕志伟)a)
a Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001, China; b College of Science, Inner Mongolia University of Technology, Hohhot 010062, China; c School of Management, Harbin Institute of Technology, Harbin 150001, China
Abstract This paper reports that the pattern formation in homogeneous solutions of polyisoprene in toluene saturated with C$_{60}$ induced by a continuous-wave visible laser is observed experimentally. The transmitted beam patterns change with the increase of the laser irradiation time. In the initial phase, the patterns with concentric ring-shaped structure are formed. In the end, the patterns become speckle-shaped. The incubation time of the transmitted beam widening is inversely proportional to the laser power density and solution concentration. The pattern formation results from the optical-field-induced refractive index changes in the solutions, but the mechanism of optical-field-induced refractive index changes in the polymer solutions needs to be further studied.
Received: 16 October 2007
Revised: 15 November 2007
Accepted manuscript online:
PACS:
42.65.Sf
(Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)
Fund: Project supported by the
Multidiscipline Scientific Research Foundation of Harbin Institute of
Technology (Grand No HIT. MD. 2003. 08) and the Program of Excellence
Team in Harbin Institute of Technology.
Cite this article:
Lin Dian-Yang(林殿阳), Li Ming(黎明), Wang Shu-Jie(王淑杰), and Lü Zhi-Wei(吕志伟) Laser-induced pattern formation from homogeneous polyisoprene solutions 2008 Chin. Phys. B 17 2156
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