MULTIPHOTON EXCITATION AND RELAXATION OF THERMAL GRATINGS IN THE NEMATIC LIQUID-CRYSTAL 5CB

被引:23
作者
EICHLER, HJ
MACDONALD, R
TROSKEN, B
机构
[1] Optisches Institut Technische Universitat Berlin, D-1000 Berlin 12
来源
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1993年 / 231卷
关键词
D O I
10.1080/10587259308032488
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have observed strong thermal grating excitation in the isotropic and nematic phase of pentylcyanobiphenyl (5CB) in wave-mixing experiments using intense green picosecond excitation pulses at lambda(exc) = 532 nm. It is shown that optical heating is provided by a three-photon absorption process in the commonly called ''highly transparent'' liquid crystal. We have further investigated the relaxation of the induced thermal gratings, which exhibits a critical slowing at the nematic-isotropic phase transition.
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页码:1 / 10
页数:10
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