Imaging Science and Photochemistry ›› 2007, Vol. 25 ›› Issue (4): 241-248.DOI: 10.7517/j.issn.1674-0475.2007.04.241

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Third-Order Nonlinear Optical Properties of Croconium Dye for a Kind of Near Infrared Dye Used as Optical Record and Storage Material

LI Zhong-Yu1,2, XU Song3, HUANG Xin1, ZHANG Fu-shi1, Kazuo Kasatani4   

  1. 1. The Key Lab.of Organic Photoelectrons & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China;
    2. Department of Chemical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, P.R.China;
    3. Department of Application Technology, Northeast China University of Electric Power Engineering, Jilin 132021, Jilin, P.R.China;
    4. Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai, Ube 755-8611, Japan
  • Received:2006-10-13 Revised:2006-12-22 Online:2007-07-23 Published:2007-07-23

Abstract: As a new type of near infrared dye,croconium dyes have drawn much attention for their potential applications in the fields of optical record and storage,and nonlinear optical materials because of their thermal and optical stability as well as intense fluorescence.The third-order optical nonlinearities and responses of a croconium dye(1,3-bis[(3,3-dimethylindolin-2-ylidene)methyl] croconine) in tetrahydrofuran(THF) solution and in poly(methyl methacrylate)(PMMA) coating films were measured using a femtosecond degenerate four-wave mixing(DFWM) technique with a laser pulse of 130 fs system under resonant conditions.The molecular hyperpolarizability,γ of the croconium dye in THF solution was determined to be about 5.3×10-29 esu,and the third-order nonlinear optical susceptibilities,χ(3) of the present PMMA coating films containing the croconium dye was measured to be of the order of 10-8 esu.Furthermore,the dynamic of DFWM optical response for croconium dye was also studied and analysed.

Key words: nonlinear optics, optical record and storage, croconium dye, near infrared absorption

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