| LiNbO3晶体在室温—130℃的锥光干涉及折射率的异常 |
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| 引用本文： | 许自然,沈惠敏,王咸,王业宁.LiNbO3晶体在室温—130℃的锥光干涉及折射率的异常[J].物理学报,1984,33(8):1192-1195. |
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| 作者姓名： | 许自然 沈惠敏 王咸 王业宁 |
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| 作者单位： | 南京大学固体物理研究所 |
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| 摘 要： | 研究了纯及掺杂LiNbO3(下简写为LN)晶体z向通光的锥光干涉图。纯LN,在45℃和75℃附近,双折射率均有异常变化,晶体由单轴变为双轴晶。掺杂(Fe,Cr,Cu)LN也有类似的变化,但变化的温度范围被加宽。分别测量了折射率n0和ne,在这两个温度附近有异常跳变。通过与x方向加电场的室温锥光图相比较,可以认为在75℃附近的双折射异常变化是相当于离子位移在x方向产生105V/m量级的内电场所引起的。
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| 收稿时间： | 1984-02-20 |
ANOMALIES OF LiNbO3 CRYSTAL IN CONOSCOPIC INTERF-ERENCE PATTERN AND REFRACTIVE INDEX BETWEEN ROOM TEMPERATURE AND 130℃ |
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| XU ZI-RAN,SHEN HUI-MIN,WANG XIAN and WANG YE-NING.ANOMALIES OF LiNbO3 CRYSTAL IN CONOSCOPIC INTERF-ERENCE PATTERN AND REFRACTIVE INDEX BETWEEN ROOM TEMPERATURE AND 130℃[J].Acta Physica Sinica,1984,33(8):1192-1195. |
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| Authors: | XU ZI-RAN SHEN HUI-MIN WANG XIAN and WANG YE-NING |
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| Abstract: | Conoscopic interference pattern in pure and doped LiNbO3 (LN) has been investigated with the light propagated along z direction. Anomalous change of birefrigence is observed at about 45 ℃ as well as 75 ℃ in pure LN. The crystal changes from uniaxial crystal to biaxial crystal near these two temperatures. Similar phenomena also occur in doped LN, but the temperature ranges of the anomalies are widened. The index of refraction n0 and ne were both measured. Abrupt changes are also discovered at about 45℃ and 75℃ . The behavior of conoscopic interference at 75℃ is very similar to that of the electrooptic effect with the electric field being applied along x direction of LN at room temperature. This suggests that the anomalous change at 75℃ in LN is caused by internal electric field of about 105V/m resulting from the displacement of ions along x direction in LN. |
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