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Investigation of stability and nonlinear optical properties CdSe colloidal nanocrystals
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The present paper investigates the linear and nonlinear optical properties of CdSe
nanocrystals which have been prepared by an improved sol-gel green technique. UV-visible absorption spectroscopy and Z-scan technique were used to identify the linear and nonlinear optical properties of CdSe
nanocrystals. The maximum peaks absorption for two samples 2.5 nm and 3 nm were 480 nm and 485 nm, respectively. In addition, the linear absorption coefficients (α), the nonlinear
absorption coefficients (β), and the nonlinear
refractive index (n2), with their signs and magnitudes for two different sizes of CdSe
(QDs) were obtained in 15, 25, and 50 mW laser intensities using the single beam Z-scan method by a continuous wave He-Ne laser at 632.8 nm wavelength. Finally, the photostability and chemical stability of the CdSe
QDs were studied that have shown high stability of CdSe
nanocrystals. The mentioned nonlinear optical properties have not been reported before.
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