| Summary: | 碩士 === 國立臺灣海洋大學 === 光電科學研究所 === 106 === The nonlinear optical properties of two different concentration of Tungsten Disulfide dispersion were investigated using the Z-scan technique with femtosecond laser pulses at 790 nm.
Concentration 0.026mg/1mL nonlinear refractive index n2 and real part of the third-order nonlinear susceptibility χ(3) of Tungsten Disulfide dispersion were (2.334±0.101)×10^(-11)(esu) and (8.742±0.381)×10^(-12)(esu), respectively.
Concentration 1mg/1mL nonlinear refractive index n2 and real part of the third-order nonlinear susceptibility χ(3) of Tungsten Disulfide dispersion were (9.5±0.18)×10^(-11)(esu) and (3.68±0.07)×10^(-11)(esu) , respectively.
The result demostrate reverse saturable absorption of 0.026mg/1mL Tungsten Disulfide dispersion and 1mg/1mL Tungsten Disulfide dispersion with a two photon absorption coefficient, β were (3.362±0.063)×10^(-10) (cm⁄W) and (6.816±0.208)×10^(-8) (cm)⁄W) , respectively.
We speculate that when nonlinear changes due to increased concentration of the sample, a solvent tungsten disulfide volume fraction increases, the number of molecules in dispersion, tungsten disulfide increases, and the distribution becomes more uniform. Resulting in a more dense array of molecules, leading to an increase in the nonlinear coefficient. .
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