Determination of third- and fifth-order nonlinear coefficients by using quasi-one-dimensional slit beam Z-scan technique

作者：Lu Shi Zhuan^*; Wang Hui Tian

来源：Journal of Applied Physics, 2009, 105(3): 033104.

DOI：10.1063/1.3075831

• absorption coefficients
• nonlinear optics
• refractive index
• two-photon processes

We report a theoretical study on the Z-scan technique by using quasi-one-dimensional slit beam, when a nonlinear medium possesses third- and fifth-order nonlinearities simultaneously. For the case when the third- and fifth-order nonlinear refraction coefficients gamma and gamma(') have the same sign, we can extract both gamma and gamma(') from the empirical formula we found. When gamma and gamma(') have the opposite sign, a high-accuracy method was proposed to allow the determination of the nonlinear refraction coefficients related to the third- and fifth-order effects. We also find the empirical formulae, which can easily estimate the pure two-photon absorption coefficient and the pure three-photon absorption coefficient, respectively.

• 出版日期2009-2-1