Abstract
Organic and polymer structures exhibit large ultratast second- and third-order nonlinear optical properties due to highly charged correlated -π-electron excitations. Rapid advances in the field are being achieved through development of high- strength polymer structures possessing both outstanding primary nonlinear optical properties and secondary structural properties as recently demonstrated, for example, in high-performance rigid rod poly(benzobisazole)(PB2) polymer structures,1,2 Since each rigid rod polymer chain is essentially a densely packed linear array of linked monomer units, a repeat unit can be viewed as the finite chain limit to the corresponding infinite polymer chain. Accordingly, we report experimental and theoretical studies of the microscopic third- order susceptibilities γijkl (-ω4,ω3,ω2,ω1) of centro-symmetric trans-benzobitsoxazole (TBOZ) and trans-benzobisthiazoie (TBTZ) repeat unit structures of PBZ polymers (Fig. 1).
© 1987 Optical Society of America
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