Third-order nonlinear optical properties of thin films of poly(p-phenylene benzobisthiazole) and its molecular composites with polyamides

The nonresonant third-order nonlinear optical properties of thin films of poly(p-phenylene benzobisthiazole) (PBZT) and PBZT/nylon 66 and PBZT/poly(trimethylhexamethylene terephthalmide) (PTMHT) molecular composites have been investigated using picosecond third-harmonic generation at 1.9 μm. The mea...

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Bibliographic Details
Published in:Applied physics letters 1991-02, Vol.58 (7), p.663-665
Main Authors: VANHERZEELE, H, METH, J. S, JENEKHE, S. A, ROBERTS, M. F
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Wave optics
Wave propagation in random media
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Summary:The nonresonant third-order nonlinear optical properties of thin films of poly(p-phenylene benzobisthiazole) (PBZT) and PBZT/nylon 66 and PBZT/poly(trimethylhexamethylene terephthalmide) (PTMHT) molecular composites have been investigated using picosecond third-harmonic generation at 1.9 μm. The measured χ(3)(−3ω,ω,ω,ω) for the pure PBZT was (1.37±0.27)×10−11 esu. The χ(3) of PBZT/nylon composites showed a linear dependence on composition. In contrast, the χ(3) of PBZT/PTMHT molecular composites significantly deviated from this linear dependence, showing enhanced values. No in-plane anisotropy in any of the films was detected. The optical damage threshold of PBZT was measured to be ≳50 GW/cm2 for 30 ps pulses at 1.9 μm.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.104561