| 热自聚焦诱导光折变非对称自散焦 |
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| 引用本文： | 佘卫龙,何穗荣,汪河洲,余振新,莫党.热自聚焦诱导光折变非对称自散焦[J].物理学报,1996,45(12):2022-2026. |
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| 作者姓名： | 佘卫龙 何穗荣 汪河洲 余振新 莫党 |
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| 作者单位： | (1)中山大学超快速激光光谱学国家重点实验室; (2)中山大学物理系 |
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| 基金项目： | 广东省自然科学基金资助的课题. |
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| 摘 要： | 用波长为５３２ｎｍ的高斯光束入射到掺杂的ＫＮＳＢＮ晶体中，对足够大的光强，观察到由热自聚焦效应诱导产生的光折变非对称自散焦．非对称自散焦的空间分布与性质都有别于噪声受激放大．它对自泵浦相位共轭无甚贡献．对开始产生非对称自散焦时晶体中光束的直径作出估计
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| 关 键 词： | 光折变 晶体 热自聚焦效应 非对称自散焦 |
| 收稿时间： | 1995-07-20 |
PHOTOREFRACTIVE ASYMMETRICAL SELF-DEFOCUSING INDUCED BY THERMAL SELF-FOCUSING |
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| SHE WEI-LONG,HE SUI-RONG,WANG HE-ZHOU,YU ZHEN-XIN and MO DANG.PHOTOREFRACTIVE ASYMMETRICAL SELF-DEFOCUSING INDUCED BY THERMAL SELF-FOCUSING[J].Acta Physica Sinica,1996,45(12):2022-2026. |
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| Authors: | SHE WEI-LONG HE SUI-RONG WANG HE-ZHOU YU ZHEN-XIN and MO DANG |
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| Abstract: | The phenomenon of photorefractive asymmetrical self-defocusing induced by thermal self-focusing is observed when a Gaussian beam at 532nm with high enough intensity is focused onto a KNSBN crystal. The spatial distribution and physical properties of the asymmetrical self-defocusing are different from those of stimulated noise scattering. It is found that asymmetrical self-defocusing has no contribution to self-pumped phase conjugation. The diameter of the beam when asymmetrical self-defocusing first appears in the crystal is estimated. |
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