Add time:09/29/2019         Source:infona.pl

Z-scan measurements of single walled carbon nanotube (SWCNT) doped with Acetylenedicarboxylic acid (cas 142-45-0) (ADC) polymer are performed using a CW diode laser at 635nm wavelength with 17mW power. The nonlinear absorption coefficient (β), nonlinear refractive index (n2), the real and imaginary parts of the third-order nonlinear optical susceptibility (Re χ3), (Im χ3) of the investigated samples are calculated. It was found that the β values decrease with increase in on-axis input intensity I0. Also, these values are found to be proportional with sample concentrations. The excited-state absorption cross sections were calculated to be at σex=5.08×10−14cm2 for the (SWCNT) and at 15.1×10−14cm2 for the ADC polymer. It was found that the σex is larger than ground-state absorption cross sections, indicating that the reverse saturable absorption mechanism (RSA) is the dominating mechanism for the observed absorption nonlinearities.

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