| KTa_(1-x)Nb_xO_3:Cu晶体中直流空间电荷场的进一步研究 |
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| 引用本文： | 杨昌喜,廉英武,叶佩弦,管庆才,王断扬. KTa_(1-x)Nb_xO_3:Cu晶体中直流空间电荷场的进一步研究[J]. 光学学报, 1993, 13(5): 461-465 |
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| 作者姓名： | 杨昌喜 廉英武 叶佩弦 管庆才 王断扬 |
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| 作者单位： | 中国科学院物理研究所 北京100080(杨昌喜，廉英武，叶佩弦)，山东大学晶体材料研究所 济南250100(管庆才)，山东大学晶体材料研究所 济南250100(王断扬) |
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| 基金项目： | 国家科委基础性研究重大关键项目No.2;国家自然科学基金 |
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| 摘 要： | 分别用扩束光和一束写入光对KTa_(1-x)Nb_xO_3:Cu(X=0.32)晶体中的光折变栅进行擦洗,通过不同的擦洗效果,进一步论证了在写入过程中除了形成周期分布的空间电荷场之外,同时还形成了直流空间电荷场.并对直流空间电荷场被擦洗的动态过程进行了详细研究.此外,在写入之前利用一束均匀光照射在外加电场作用下的KTa_(1-x)Nb_xO_3:Cu晶体,研究了直流空间电荷场的形成对衍射信号强度的影响.
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| 关 键 词： | 光折变效应 KTa_(1-x)Nb_xO_3:Cu晶体 电光效应 |
| 收稿时间： | 1992-05-29 |
Further studies of DC space-charge field in KTa_(1-x)Nb_xO_3: Cu crystals |
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| YANG Changxi LIAN Yingwu YE Peixian. Further studies of DC space-charge field in KTa_(1-x)Nb_xO_3: Cu crystals[J]. Acta Optica Sinica, 1993, 13(5): 461-465 |
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| Authors: | YANG Changxi LIAN Yingwu YE Peixian |
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| Abstract: | The photorefractive grating in a KTa1-xNbxO3 : Cu ( x = 0. 32) crystal was erased with an expanded beam and one of the writing beams, respectively. Through the different erasing effects, it was further demostrated that besides a periodic space-charge field a DC space-charge field was formed simultaneously during writing. Meanwhile the dynamics of erasing a DC space-charge field was also studied. In addition, by irradiatingKTa1-xNbxO3 : Cu crystal with one of the writing beams under an applied electric field before writing, the influence of the formation of DC space-charge field on the diffraction intensity was investigated. |
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| Keywords: | photorefractive effect KTa1-xNbxO3:Cu crystal electro-optic effect. |
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