| 激光热诱导PbS纳米微粒的自陷、衍射和自散焦现象 |
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| 引用本文： | 欧慧灵,彭淑鸽,韩俊鹤. 激光热诱导PbS纳米微粒的自陷、衍射和自散焦现象[J]. 光散射学报, 2004, 16(3): 246-249 |
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| 作者姓名： | 欧慧灵 彭淑鸽 韩俊鹤 |
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| 作者单位： | 东南大学物理系,南京,210096;河南大学物理系,开封,475001 |
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| 摘 要： | 用波长为488nm的氩离子激光与聚乙烯吡咯烷酮(PVP)修饰的PbS纳米微粒水溶胶作用,观察到了样品的自陷、衍射和自散焦现象,样品的折射率为负。测量了自陷阈值功率,计算了样品的非线性折射率n2。样品响应时间为11.86ms,且对488nm波长的光有吸收,说明样品的上述现象主要是由激光热诱导折射率的改变所引起的。
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| 关 键 词： | PbS纳米微粒 自陷 自散焦 激光热诱导折射率 非线性折射率 响应时间 |
| 文章编号： | 1004-5929(2004)03-0246-04 |
| 收稿时间： | 2003-11-20 |
| 修稿时间： | 2003-11-20 |
Laser-heating-induced Self-trapping,Diffraction and Self-defocusing from PbS Nanoparticles |
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| OU Hui-ling,PENG Shu-ge,HAN Jun-he. Laser-heating-induced Self-trapping,Diffraction and Self-defocusing from PbS Nanoparticles[J]. Chinese Journal of Light Scattering, 2004, 16(3): 246-249 |
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| Authors: | OU Hui-ling PENG Shu-ge HAN Jun-he |
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| Abstract: | We have used a cw Argon ion laser (λ=488nm)for the generation of self-trapping,diffraction and self-defocusing from PbS nanoparticles modified by PVP。The sample's nonlinear refractive index n2 is negative, which can be determined is by measuring sample's critical power of self-trapping。Rise time of the sample is 11.86ms and there are absorption at 488nm wavelength, so laser-heating-induced changes of refractive index causes the phenomena mentioned above。 |
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| Keywords: | PbS nanoparticles self-trapping self-defocusing laser-heating-induced refractive index nonlinear refractive index rise time |
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