THIRD ORDER NONLINEAR OPTICAL PROPERTIES OF MAGNESIUM PHTHALOCYANINE THIN FILM BY He-Ne LASER
نویسندگان
چکیده
In the present work, The third order optical nonlinearity and optical limiting properties of Magnesium phthalocyanine (MgPc) thin film have been investigated. Third order optical nonlinearity of MgPc thin film has been studied by z–scan method using a cw He-Ne laser at ~633nm wavelength as an exciting source. The normalized transmission for both open and closed aperture z scan are measured and it is found that the nonlinear absorption in MgPc is mainly due to reverse saturable absorption (RSA) process. The nonlinear refraction studies exhibit the self defocusing behavior of the MgPc thin film and the origin of nonlinear refraction is of thermal nature. The optical limiting study revealed that MgPc thin film shows lower limiting threshold that is very useful for eyes and sensor protection.
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