TY - JOUR AU - Al-Saidi, Imad Al-Deen Hussein Ali AU - Hussein, Hussein Falih AU - Hashim, Numan Sleem PY - 2021/01/08 Y2 - 2024/03/29 TI - NONLINEAR OPTICAL PROPERTIES AND OPTICAL POWER LIMITING OF POLY (3HT- Co - Th) - PMMA POLYMER BLEND FILMS JF - International Journal of Engineering Science Technologies JA - Int. J. Eng. Sci. Tech VL - 5 IS - 1 SE - Articles DO - 10.29121/ijoest.v5.i1.2021.142 UR - https://www.granthaalayahpublication.org/ojs-sys/ijoest/article/view/IJOEST_142 SP - 1-10 AB - <p>Poly (3 - Hexylthiophene - Co - Thiophene) copolymer was prepared by using the addition polymerization method. The Nonlinear optical properties and the behavior of the optical power limiting of the prepared polymer blend poly (3HT- Co - Th) - PMMA films were studied by using the z - scan technique for different weight ratios of the copolymer poly (3HT- Co - Th). In the present work, a continuous wave (CW) diode - pumped solid - state laser (DPSSL) of wavelengths 532 nm was used for the irradiation of the prepared film samples. The nonlinear optical parameters such as, the nonlinear refractive index (n<sub>2</sub>), the nonlinear absorption coefficient (β), and the&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; third - order - nonlinear optical susceptibility (χ (<sup>3</sup>)) of the polymer blend poly (3HT- Co - Th) - PMMA films were determined for different weight ratios of the copolymer poly (3HT- Co - Th). It is observed that the polymer blend poly (3HT - Co - Th) - PMMA films exhibit saturable absorption (SA) and self - defocusing effects, and this gives an indication that both, the nonlinear refractive index (n<sub>2</sub>) and the nonlinear absorption coefficient (β), have negative values. The obtained results indicate that the prepared polymer blend poly (3HT - Co - Th) - PMMA films are promising materials and can be considered as suitable materials for different optical and electronic applications.</p> ER -