Nonlinear optical responses of Sudan IV doped liquid crystal by z-scan and moiré deflectometry techniques |
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| Authors: | M.H. Majles Ara S.H. Mousavi E. Koushki S. Salmani A. Gharibi A. Ghanadzadeh |
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| Affiliation: | aPhotonics Laboratory, Physics Department, Tarbiat Moallem University, Mofateh 49, Tehran, Iran;bMedical University of Qom, Qom, Iran;cDepartment of Chemistry, Faculty of Science, Guilan University, Rasht, Iran |
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| Abstract: | The nonlinear optical properties of a nematic liquid crystal doped with an azo dye were investigated. The magnitude and the sign of the third-order nonlinear refractive index, n2, were measured using both single-beam z-scan and moiré deflectometry techniques. The measurements were performed at 532 nm using a Nd:Yag CW laser. The positive sign showed that sample which was studied possess a self-focusing optical nonlinearity. Rather close agreement was found between the values for n2 obtained by z-scan and by moiré deflectometry. The nonlinear refractive index was found to be in the order of 10− 6 (cm2/W) and the nonlinear absorption coefficient to be β = 0.171 (cm/W). |
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| Keywords: | Optical materials Nonlinear refractive index Dye-doped liquid crystal Z-scan Moiré deflectometry |
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