Single beam Z-scan measurement of the third order optical nonlinearities of styryl7 dye |
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Authors: | S Kumaresan M Basheer Ahamed |
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Institution: | 1. Department of Physics, GKM College of Engineering & Technology, Chennai 600063, India;2. Department of Physics, BS Abdur Rahman University, Chennai 600048, India |
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Abstract: | The optical nonlinearity of styryl7 dye in ethanol solution at different concentrations has been studied using pulsed Nd:YAG laser at 532 nm as the source of excitation. The optical responses were characterized by measuring the intensity dependent refractive index (n2) of the medium using the Z-scan technique. The open aperture Z-scan trace of the dye in solution displayed saturable absorption. The closed aperture Z-scan trace of the dye exhibited a negative nonlinearity. The styryl7 dye at 1 mM concentration exhibited nonlinear refractive co-efficient n2 = −1.24 × 10−8 cm2/W, nonlinear absorption coefficient β = − 3.9 × 10−4 cm/W and real and imaginary parts of third-order nonlinear optical susceptibility χ3 = 3.26 × 10−6 esu in ethanol. These results showed that the dye has potential application in nonlinear optics. |
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Keywords: | Z-scan Nonlinear refractive co-efficient Nonlinear absorption co-efficient Third-order nonlinear susceptibility Nonlinear materials |
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