Nonlinear Optical Studies of [(C4H9)4N][Ni(dmit)2] by Z-Scan Technique

Abstract

Nonlinear optical properties of an organo-metallic compound [(C4H9)4N][Ni(dmit)2] (dmit=2-thioxo-1,3-dithiole-4,5-dithiolate), abbreviated as BuNi, dissolved in acetone, are investigated using the Z-scan technique with a 40ps pulse width at 1064nm and a 1 ns and 15ns pulse width at 1053nm. Strong saturable absorption is found when the sample solution is irradiated by 40ps and 1 ns laser pulses. When irradiated with a 15ns laser pulse, a stronger reverse saturable absorption is found. The nonlinear optical absorption coefficients are −1.06 × 10−11, −2.02 × 10−11 and 2.73 × 10−10 m/W, respectively. All the results suggest that BuNi may be a promising candidate in the application of laser pulse compression in the near-infrared waveband.