Isotropic diffraction induced by concentration gratings in α-LiIO3:Fe
| Autor: | Franco Laeri, U. Vietze, Martin Fally, Qian Sun, Romano A. Rupp |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Diffraction
Materials science business.industry Isotropy Physics::Optics Nonlinear optics Lithium iodate Dielectric Grating Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound Optics chemistry Physics::Atomic Physics Electrical and Electronic Engineering Physical and Theoretical Chemistry Absorption (electromagnetic radiation) business Anisotropy |
| Zdroj: | Optics Communications. 189:151-159 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/s0030-4018(01)01005-7 |
| Popis: | Iron doped lithium iodate (α-LiIO 3 :Fe) of hexagonal modification is investigated by holographic experiments in a geometry where an electrooptic contribution to the diagonal elements of the change of the dielectric permittivity tensor is forbidden by symmetry. Anisotropic diffraction (electrooptically allowed) which we expected to observe in that geometry did not occur. Instead, isotropic diffraction (electrooptically forbidden) from light-induced gratings was found. To clarify its origin the properties of these gratings are studied as well as photo-induced transparency occurring in the ultraviolet. The experiments show that two types of gratings exist, one of them being an absorption grating. The second grating is attributed to originate from concentration changes which arise from the transport of ions triggered by non-uniform illumination. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect