3RD-ORDER NONLINEAR-OPTICAL PROPERTIES OF NEW SOLUBLE 4-N-HEPTYLPHENYLOXY)-3,5-DIFLUOROPHENYL]BUTADIYNE)

A new soluble polydiacetylene with fluoro-aromatic rings directly atta ched to the pi-conjugated main-chain backbone was synthesized by gamma -radiation solid-state polymerization. The blue thin films of poly(flu orophenyl-diacetylene) could be only obtained from its red chloroform solution by a spin-coating technique. The third-order nonlinear optica l susceptibilities of spin-coated amorphous thin films of poly(fluorop henyl-diacetylene) were measured by third-order harmonic generation. T he third-order nonlinear optical coefficient susceptibility chi((3)), calculated by comparing the 3 omega signal intensity of sample with th at of a standard fused silica plate, was about 6.4 x 10(-11) esu.