排序方式: 共有8条查询结果,搜索用时 15 毫秒
1
1.
2.
3.
4.
TWO-WAVE COUPLING IN PHOTOREFRACTIVE TRANSITION METAL DOPED POTASSIUM SODIUM BARIUM STRONTIUM NIOBATE CRYSTALS 下载免费PDF全文
Large values of the exponential gain coefficient are obtained (Γ= 8-20cm-1) in photorefractive potassium sodium barium strontium niobate crystals doped with transition metal elements: Co, Gu, Fe, Cr and Ni by using two-wave coupling experiments with argon ion laser (λ = 488nm). The response time is measured to be 60-1000ms at an intensity of 5W/cm2 for various samples. We find that in all the crystals electrons are the dominant photorefractive charge carriers, and the typical density of carriers is 1016-1017 cm-3. 相似文献
6.
7.
对多种掺杂的铌酸钾钠锶钡(KNSBN)单晶样品进行了二波耦合测量,着重研究了二波耦合中各样品的增益系数Γ与两光束入射夹角2θ的关系,以及Γ与光强I的关系。用光折变理论公式拟合Γ-2θ关系的实验结果,求得不同样品的有效光折变电荷密度、有效电光系数和电子-空穴对抗率等参数值。采用一种模型,推导出测定与光强有关的增益系数的解析表达式,并应用于Γ-I关系的实验结果分析。测量结果显示,一些掺杂的KNSBN晶体具有很大的Γ值(>15cm-1)。 相似文献
8.
1