Z-scan measurement of a novel amorphous molecular material

The nonlinear optical refractive and absorption of the novel amorphous mole cular material. 5.5 ' -bis(dimesitylboryl)-2,2 ' -bithiophene have been inv estigated by using the Z-scan technique with a nanosecond-pulsed Nd:YAG las er at its second harmonic (532 nm) radiation. The nonlinear transmission ch aracteristics exhibit saturable absorption at 532 nm and are explained by u sing the three-level saturable model. The saturation intensity, the real an d imaginary parts of the nonlinear refraction index along with their sign w ere determined. These results indicate that BMB-2T is promising material fo r photonic applications. (C) 2001 Published by Elsevier Science B.V.