The nonlinear refraction index n2 were estimated according to the closed - aperture z - scan curves
2.
Secondly , the third order nonlinear optical properties of these compounds are studied under the excitation of ps pulsed laser with the wavelength of 1064nm using z - scan technique , nonlinear refractive indices and nonlinear absorption coefficients are calculated according to the z - scan experiment curves of the compounds . all the three compounds have self defocusing characters and two photon absorptions . lastly , nonlinear refraction and absorption properties of these compounds are studied by z - scan technique under the excitation of ps pulsed laser with the wavelength of 532nm the self defocusing and reverse saturation absorption are found in these compounds
3.
On theoretical , a diffraction model of a nonlinear optical medium to a gaussian beam was built based on fresnel - kirchhoff diffraction theory . the propagation behavior of the gaussian beam passing through the nonlinear optical medium was theoretically deduced and numerically simulated , which could explain the z - scan phenomenon from a new approach . it provides a new way to calculate the nonlinear refraction index and the two - photon absorption coefficients
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