| Ce∶KNSBN晶体两波耦合中的光扇效应 |
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| 引用本文： | 郭庆林,刘峰,梁宝来,张金平,魏艳红. Ce∶KNSBN晶体两波耦合中的光扇效应[J]. 光学学报, 2004, 24(4): 527-530 |
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| 作者姓名： | 郭庆林 刘峰 梁宝来 张金平 魏艳红 |
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| 作者单位： | 河北大学物理科学与技术学院 保定071002(郭庆林，刘峰，梁宝来，张金平)，河北大学物理科学与技术学院 保定071002(魏艳红) |
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| 基金项目： | 河北省自然科学基金 (10 10 5 9)，河北省科技厅(32 135 10 4 )资助课题 |
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| 摘 要： | 采用两波耦合非同时读出实验装置 ,测量了掺铈钾钠铌酸锶钡 (Ce∶KNSBN)晶体两波耦合过程中的信号光和抽运光非同时打开条件下两波耦合增益的时间变化规律 ,讨论了光扇的入射光强阈值及光扇效应对两波耦合动态过程的影响。结果表明 :6 32 .8nmHe Ne激光在Ce∶KNSBN晶体中写入体光栅时 ,光扇效应存在明显的写入光强阈值特性 ,当入射光强大于 30mW /cm2 时 ,才存在强烈的光扇效应。利用修正耦合波方程对Ce∶KNSBN晶体中的两波耦合动态过程、增益随着信号光和抽运光打开时间间隔Δt的变化进行了模拟计算 ,理论模拟结果与实验测量结果基本一致
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| 关 键 词： | 光折变晶体 光扇效应 两波耦合 动态特性 阈值 |
| 收稿时间： | 2003-04-06 |
The Fanning Effect on the Dynamics of Two-Wave Coupling in Ce∶KNSBN Photorefractive Crystal |
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| Guo Qingling Liu Feng Liang Baolai Zhang Jingping Wei Yanhong. The Fanning Effect on the Dynamics of Two-Wave Coupling in Ce∶KNSBN Photorefractive Crystal[J]. Acta Optica Sinica, 2004, 24(4): 527-530 |
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| Authors: | Guo Qingling Liu Feng Liang Baolai Zhang Jingping Wei Yanhong |
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| Abstract: | A non-synchronously-numerating experimental system is applied to measure the gain of two-wave coupling in a Ce∶KNSBN crystal while the signal beam and the pump beam are non-simultaneously opened, and the effect of fanning on the dynamical characteristics of two-wave coupling is discussed. It is shown that there is significant writing beam intensity threshold effect of fanning as 632.8 nm He-Ne laser is used to write the volume grating in Ce∶KNSBN crystal, and obvious fanning occurs only if the writing beam intensity is higher than 30 mW/cm2. Modified wave-coupling equations are used to simulate both the dynamical process of two-wave coupling and the gain as a function of the opening time interval between the signal beam and the pump beam. The theoretically calculated results are coincident with the experiment data. |
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| Keywords: | photorefractive crystal fanning effect two-wave coupling dynamical characteristics threshold |
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