STUDY ON THIRD-ORDER OPTICAL NONLINEARITY OF BIS(TETRABUTYLAMMONIUM)-Hg(dmit)2 BY FEMTOSECOND OPTICAL KERR GATE TECHNIQUE

Bis(tetrabutylammonium)-Hg(dmit)(2) was synthesized and its sample solution's optical Kerr Effect (OKE) signal was measured by the femtosecond optical Kerr gate technique. With the concentration of 9.27 x 10(-4) M, the sample solution's third-order optical susceptibility was obtained to be 2.53 x 10(-14) esu by using the CS2 OKE signal as reference signal measured under identical conditions. The second-order hyperpolarizability for the bis(tetrabutylammonium)-Hg(dmit)(2) molecular was estimated to be 1.7 x 10(-32) esu. Its response time was about 226 Is, which is believed to be the contribution from the delocalized electrons.