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1 December 1990 Dihedral rigid molecule in crystal engineering for optimized phase-matchable SHG: DNBB
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It is important to control a polarization anisotropy, thus, a molecular alignment in obtaining such a crystal that can exhibit optimized phase-matchable second harmonic generation ( SHG ). Along with this view, we designed a novel dihedral rigid molecule which has two nitroaniline moieties rigidly connected each other through two adjacent sp3 carbons. We synthesized the molecules so designed and examined their crystals in SHG activities and phase-matching characteristics by a convenient powder method with a Nd:YAG laser. It has been found that one of crystals, namely, 3,9-dinitro-5a,6, ha, 12-tetrahydro[1,4]benzoxadino[3 ,2-bJ][1,4]- benzoxadine ( DNBB ) crystal manifests larger phase-matchable SHG than N-(4-nitrophenyl)-L-prolinol ( NPP ) crystal so far known as the typical efficient phase-matchable organic crystal. DNBB crystal has been shown to possess much improved material properties ; high thermal stability, distinguished hardness, insolubility to water, no sublimation, and high registivity to optical damage, for device applications in comparison with the crystals of p-nitroaniline derivatives reported so far.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tetsuya Tsunekawa, Tetsuya Gotoh, Hiroshi Mataki, and Masao Iwamoto "Dihedral rigid molecule in crystal engineering for optimized phase-matchable SHG: DNBB", Proc. SPIE 1337, Nonlinear Optical Properties of Organic Materials III, (1 December 1990);

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