Nonlinear optical properties of the "green" liquid laser medium

Abstract

Using Nd2O3 and HCl as raw materials, Nd(phen)2Cl3 was obtained and its spectral characteristics were measured. With Nd2O3, benzoic acid and o-phenanthroline as the raw material, green liquid laser medium Nd3+ ions complexes-NdB3phen (tribenzoic acid-phenanthroline co-Nd) was prepared. The third-order non-linear optical properties of NdB3 phen were studied using femtosecond laser and signal-beam Z-scan method. When the incident femtosecond laser pulse wavelength is 400 nm, the peak power density is 2.94 × 1014 W/m2, and pulse width is 117 fs, the measured nonlinear refractive-index coefficient of the sample is -2.84 × 10-15 cm2/W. Under the opening aperture configuration, NdB3phen presents phenomenon of the reverse saturated absorption, and the measured two-photon absorption coefficient is estimated to be 9.11 × 10-12 m/W. The experimental results show that two-photon absorption coefficient and nonlinear refractive-index coefficient of NdB3phen refractive index become more intense.