Investigation of nonlinear optical absorption in a triphenylamine derivative and its potential application in ultrafast and broadband laser protection

The ultrafast optical nonlinearity of a triphenylamine derivative (TCTA) is studied via Z-scan. Nonlinear optical absorption of the compound is investigated at various wavelengths. Results indicate that two-photon absorption and two-photon induced excited state absorption involve in the nonlinear absorption. The cooperation between two mechanisms extends enhances the nonlinear absorption and extends its spectrum, suggesting it a potential material for ultrafast laser protection.