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Study of the Nonlinear Absorption Properties of Copper Phthalocyanine with Femtosecond Laser (pp. 179-224) $100.00
Authors:  (Fang Li, Laboratory of Optical Information and Technology, School of Science, Wuhan Institute of Technology, Wuhan, P.R. China)
The traditional dyes have been growing rapidly as “functional dyes” because of their
special properties of optics, electronics and magnetism in the field of high-tech. In the
known “functional dyes,” phthalocyanines have attracted a great deal of attentions due to
their unique physical and chemical properties. Among them, the metal-phthalocyanine, as
a very promising organic nonlinear optical material, has particularly aroused strong
research interest. In this chapter, experimental and theoretical studies on the nonlinear
absorption (NLA) properties of copper-phthalocyanine (CuPc) are performed by the
sensitive single-beam z-scan technique using the femtosecond laser. The main contents
and research conclusions are summarized as following:
The NLA properties of CuPc solutions are studied by the femosecond z-scan
technique. The influence of excitation laser power and solution concentration on the NLA
properties are discussed in detail. The results show that the CuPc solutions exhibit reverse
saturable absorption (RSA) effect, and it was found the RSA mainly originates from
three-photon absorption (3PA). The RSA effect becomes stronger with the excitation
laser power increasing when the sample solution concentration is low, while for the high
concentration sample solution, with the excitation laser power increasing, the RSA effect
firstly becomes stronger, then becomes saturable, and finally becomes weaker due to the
“optical fading” phenomenon.
The NLA properties of CuPc thin film are performed by the femtosecond z-scan
technique. A transition from SA to RSA is observed as the excitation intensity is
increased. An efficient four-energy-level model for the organic materials excited by
femtosecond pulse laser is developed, and based on which the dynamic rate equation
analysis is performed and the intensity dependence of level populations is 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 when the input laser intensity reaches a critical value.
Furthermore, it is found that the copper phthalocyanine thin film possesses a large fifthorder
absorption coefficient β(5) (0.24×10-21 cm3/W2). It indicates that the copper
phthalocyanine thin film could be a very promising candidate for optical limiting

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Study of the Nonlinear Absorption Properties of Copper Phthalocyanine with Femtosecond Laser (pp. 179-224)