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.

引用

页码：1 / 10

页数：10

共 18 条

[1] ABSORPTION AND FLUORESCENCE-SPECTRA OF 4-CYANOBIPHENYL AND 4'-ALKYL-SUBSTITUTED OR 4'-ALKOXY-SUBSTITUTED LIQUID-CRYSTALLINE DERIVATIVES [J].