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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 19 — Sep. 15, 2008
  • pp: 14571–14581

Nonlinear absorption in CuPc-doped PMMA thin film in the femtosecond regime: Experimental and theoretical studies

Fang Li, Peixiang Lu, Hua Long, Guang Yang, Yuhua Li, and Qiguang Zheng  »View Author Affiliations

Optics Express, Vol. 16, Issue 19, pp. 14571-14581 (2008)

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The nonlinear absorption (NLA) properties of copper ph-thalocyanine (CuPc)-doped polymethylmethacrylate (PMMA) thin film in the femtosecond regime were investigated both experimentally and theoretically. The open-aperture (OA) Z-scan measurements of the film were carried out by femtosecond laser pulse. A transition from saturable absorption (SA) to reverse saturable absorption (RSA) was observed as the excitation intensity is increased. The rate equation analysis based on an developed efficient energy level model was performed and the intensity dependence of level populations was obtained, which reveals the source of NLA. The results show that the transition from SA to RSA is ascribed to the fifth-order effect of excited-state absorption (ESA) induced by two-photon absorption (TPA) process. Furthermore, it is found that the CuPc-doped PMMA thin film possesses a large fifth-order coefficient (β (5)) of 0.24×10-21cm3/W2. It indicates that the CuPc-doped PMMA thin film could be a promising candidate for optical limiting material.

© 2008 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(190.7110) Nonlinear optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: July 8, 2008
Revised Manuscript: August 26, 2008
Manuscript Accepted: August 26, 2008
Published: September 2, 2008

Fang Li, Peixiang Lu, Hua Long, Guang Yang, Yuhua Li, and Qiguang Zheng, "Nonlinear absorption in CuPc-doped PMMA thin film in the femtosecond regime: Experimental and theoretical studies," Opt. Express 16, 14571-14581 (2008)

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