DISPERSION OF 2ND-ORDER OPTICAL-PROPERTIES OF NEW HIGH THERMAL-STABILITY GUEST CHROMOPHORES

A new class of high thermal stability fused-ring guest chromophores in tended for incorporation into highly stable host polyimides has been s uccessfully developed. Thermal stabilities far in excess of 300-degree s-C have been achieved for both the pure guest and the parent guest-ho st systems. dc-induced second harmonic generation measurements of the microscopic second order beta of the guest chromophores in solution ha ve been performed using an optical parametric generation technique. In the near-infrared region, values of the standard product mubeta of or der 10(3) X 10(-48) esu have been observed. These values are in good a greement with quantum many-electron calculations.