| Light-induced scattering in SBN：Cr crystal under external electric fields and its suppression |
| |
| 引用本文： | 赵建林,李振伟,杨德兴,马仰华.Light-induced scattering in SBN：Cr crystal under external electric fields and its suppression[J].中国物理 B,2004,13(9):1464-1467. |
| |
| 作者姓名： | 赵建林 李振伟 杨德兴 马仰华 |
| |
| 作者单位： | Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China;Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China;Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China;Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
| |
| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No 60077018). |
| |
| 摘 要： | In this paper, the enhancement of light-induced scattering in congruent SBN:Cr (Sro.61Bao.39Nb206:Cr) crystals in the presence of an externally applied electric field and its suppression are studied. If a coherent image is focalized in SBN:Cr crystal without applying external electric field, the output image will remain clear, because of the weak photorefractive effect in the crystal. When a field is applied properly along the crystal axis, markedly enhanced scattering from the signal beam and the output image dispersion can be observed due to the increase of the photorefractive twobeam coupling gain and the light-induced index change in SBN:Cr crystals. By introducing a coherent or incoherent beam with higher intensity the light-induced scattering can be suppressed through the erasure of scattering gratings. The difference between coherent and incoherent beam is that the former can also amplify the signal beam as the scattered light is removed, whereas the latter can only make the signal beam revert to its initial state. The results obtained under different experimental conditions are consistent with theoretical analysis.
|
| 关 键 词： | 光诱导散射 外电场 光折射双束耦合 光子晶体 锶钡铌晶体 铬掺杂 |
| 收稿时间： | 2003-08-28 |
Light-induced scattering in SBN:Cr crystal under external electric fields and its suppression |
| |
| Zhao Jian-Lin,Li Zhen-Wei,Yang De-Xing and Ma Yang-Hua.Light-induced scattering in SBN:Cr crystal under external electric fields and its suppression[J].Chinese Physics B,2004,13(9):1464-1467. |
| |
| Authors: | Zhao Jian-Lin Li Zhen-Wei Yang De-Xing and Ma Yang-Hua |
| |
| Affiliation: | Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
| |
| Abstract: | In this paper, the enhancement of light-induced scattering in congruent SBN:Cr (Sr_{0.61}Ba_{0.39}Nb_2O_6:Cr) crystals in the presence of an externally applied electric field and its suppression are studied. If a coherent image is focalized in SBN:Cr crystal without applying external electric field, the output image will remain clear, because of the weak photorefractive effect in the crystal. When a field is applied properly along the crystal axis, markedly enhanced scattering from the signal beam and the output image dispersion can be observed due to the increase of the photorefractive two-beam coupling gain and the light-induced index change in SBN:Cr crystals. By introducing a coherent or incoherent beam with higher intensity the light-induced scattering can be suppressed through the erasure of scattering gratings. The difference between coherent and incoherent beam is that the former can also amplify the signal beam as the scattered light is removed, whereas the latter can only make the signal beam revert to its initial state. The results obtained under different experimental conditions are consistent with theoretical analysis. |
| |
| Keywords: | light-induced scattering SBN:Cr crystal external electric field photorefractive two-beam coupling |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|
