中国物理B ›› 2008, Vol. 17 ›› Issue (6): 2156-2159.doi: 10.1088/1674-1056/17/6/036

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Laser-induced pattern formation from homogeneous polyisoprene solutions

林殿阳1, 吕志伟1, 黎明2, 王淑杰3   

  1. (1)Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001, China; (2)Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001, China;College of Science, Inner Mongolia University of Technology, Hohhot 010062, China ; (3)School of Management, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2007-10-16 修回日期:2007-11-15 出版日期:2008-06-20 发布日期:2008-06-20
  • 基金资助:
    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.

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)   

  1. 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
  • Received:2007-10-16 Revised:2007-11-15 Online:2008-06-20 Published:2008-06-20
  • Supported by:
    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.

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摘要： 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.

关键词: laser-induced, pattern formation, polyisoprene

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.

Key words: laser-induced, pattern formation, polyisoprene

中图分类号:  (Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)

  • 42.65.Sf
42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.70.Jk (Polymers and organics)