Thermal Nonlinear Refraction and Saturable Absorption of Platinum Nanoparticles under Irradiation of a Continuous Wave Laser and Nanosecond Pulsed Laser
سال انتشار: 1401
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 105
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شناسه ملی سند علمی:
ARBS01_014
تاریخ نمایه سازی: 27 تیر 1401
چکیده مقاله:
This work focuses on the nonlinear properties of platinum nanoparticles (ptNPs) in the aqueous solution of sodium dodecyl sulfate (SDS) under irradiation of a continuous wave (CW) laser and a nanosecond pulse laser at the wavelength of ۵۳۲ nm. These properties are characterized by means of nonlinear transmittance, Z-scan technique, and scattered intensity assessments when submitted to laser operating at a wavelength of ۵۳۲ nm. The closed Z-scan measurements reveal thermal contribution for the nonlinear refractive index of the platinum nanoparticles in the CW regime and the saturable absorption is observed using the open aperture Z-scan method in the pulsed regime. It will be shown that the thermal thin lens model is in excellent agreement with the experimental results of the sample. A fit has allowed extracting the value of nonlinear refractive index to be -۱.۱×۱۰-۸ cm۲/W. The saturable absorption is analyzed using a phenomenological model based on nonlinear absorption and saturation intensity. The nonlinear absorption coefficient obtains ۳.۲ × ۱۰-۱۰ m-۱.
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نویسندگان
Mina Eslamifar
Physics Department, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran