普小云
从事激光和激光光谱方面的研究工作。
个性化签名
- 姓名:普小云
- 目前身份:
- 担任导师情况:
- 学位:
-
学术头衔:
博士生导师
- 职称:-
-
学科领域:
光学
- 研究兴趣:从事激光和激光光谱方面的研究工作。
普小云,男,1957年5月25日生。现为云南大学数理学院物理系教授。1982年2月毕业于云南大学物理系,获学士学位;1987年7月在中科院北京物理所获硕士学位;2000年12月毕业于香港中文大学,获博士学位;2001年至2002年在香港浸会大学从事博士后研究。1992年11月晋升副教授;1999年8月晋升教授。现从事激光和激光光谱方面的研究工作,以及物理学领域的教学工作。“伍集成文化教育基金”资助,美国耶鲁大学应用物理系和亚历桑那州立大学化学系访问学者。在国际核心刊物 “Applied Physics letters”, "Optics Letters", "Journal of American Optical Society B", "Chemical Physical Letters" 以及国内“科学通报”,“Chinese Physics Letters”, “Chinese Physics”,“物理学报”等核心刊物上发表论文五十余篇 。七项已授权国家专利的发明人之一。国家自然科学基金项目(10174060,2002.1-2004.12)主持人。云南省中青年学术带头人。
-
主页访问
4298
-
关注数
0
-
成果阅读
556
-
成果数
10
【期刊论文】用激光增益获取弱增益拉曼模式的受激拉曼散射光谱*
普小云, 杨正, 江楠, 陈永康, 戴宏
物理学报,2003,52(10):2443-06,-0001,():
-1年11月30日
当酒精的弱增益拉曼模式处于罗丹明640染料分子的激光增益范围时,在由悬垂液滴构成的圆形谐振腔中,观察到乙醇分子C—H伸缩系列模中多个弱增益拉曼模式的受激拉曼散射(SRS)光谱。随着抽运光的增强,迅速增长的强增益拉曼模式的受激辐射抑制了其他弱增益模式的SRS,并导致染料激光的完全淬灭。通过分析圆形腔腔模的光子速率方程和激光染料分子的三能级粒子数速率方程,解释了观察到的实验现象。
受激拉曼散射,, 悬垂液滴,, 弱拉曼增益模式,, 激光增益
-
119浏览
-
0点赞
-
0收藏
-
0分享
-
262下载
-
0评论
-
引用
【期刊论文】Measurement of the internal lasing intensity distribution of a dye-doped pendant drop
普小云, Xiao-Yun Pu, Chiu-Wah Chan, and Wing-Kee Lee
,-0001,():
-1年11月30日
ator formed by a dye-doped pendant drop was measured by addition of polymer particles to the dye solution to enhance the elastic-scattered light of the lasing inside the pendant drop. A theory that connects wave and ray pictures in dealing with the cavity resonance is used to calculate the internal intensity distribution. The experimental and theoretical results are in good agreement for sufficiently large densities of scattering particles, such that the cavity mode efficiency φ is~1 for all resonant modes.
-
42浏览
-
0点赞
-
0收藏
-
0分享
-
121下载
-
0评论
-
引用
【期刊论文】Lasing characteristics of a pendant drop deformed by an applied electric field
普小云, Xiao-Yun Pu and Wing-Kee Lee
,-0001,():
-1年11月30日
The lasing properties of an oval-shaped resonant cavity (ORC) with a continuously variable aspect ratio have been studied. The ORC was formed with a dye-doped pendant drop placed inside a variable static electric field. When the drop ORC was pumped by a nitrogen laser, lasing from the ORC was found to have strong directional emission characteristics and an intensity enhancement factor as great as 19.5. Calculated results of light rays escaping from ORC's by refraction are in good agreement with the experimental data.
-
44浏览
-
0点赞
-
0收藏
-
0分享
-
126下载
-
0评论
-
引用
【期刊论文】Fluorescent image analysis of the pendant drop used in a monolayer film
普小云, Xiao Yun Pu*, Zong Ming Zhang, Li Zhong Lin
Optics Communications 155(1998)33-37,-0001,():
-1年11月30日
The pendant drop technique has been used for compressing and expanding a monolayer film. Both the surface density and the molecular orientation of the surfactant on the surface of a pendant drop can be determined by a polarized fluorescent image for a surfactant molecule with a chromophore. The calculation based on the model developed matches the experimental results on octadecyl rhodamine B very well.
-
48浏览
-
0点赞
-
0收藏
-
0分享
-
131下载
-
0评论
-
引用
普小云, Xiao-Yun Pu and Zheng Yang, Wing-Kee Lee
,-0001,():
-1年11月30日
The enhancement of stimulated Raman scattering (SRS) of weak-gain Raman modes in pendant drops is accomplished by overlapping Stokes wavelengths of the Raman modes with the Rhodamine 640 dye-lasing gain region (called the gain-overlap method). The dye concentration and the pumping intensity of frequencydoubled Nd: YAG lasers determine the efficiency of the enhancement. We apply the gain-overlap technique at optimal dye concentration and pump intensity to probe minority species in pendant drops formed by binary mixtures. The limits of detectable concentrations of the minority species, methanol in methanol-ethanol and ethanol in ethanol-water (dye-doped) mixtures, are much less than those in undoped mixtures. The smooth fluorescence-lasing spectral curves emitted from dye-doped pendant drops reduce complications in distinguishing SRS signals from quasi-periodic fluorescence-lasing spectra in microdroplets.
-
49浏览
-
0点赞
-
0收藏
-
0分享
-
175下载
-
0评论
-
引用
普小云, Xiao-Yun Pu and Zheng Yang, Wing-Kee Lee
,-0001,():
-1年11月30日
The enhancement of stimulated Raman scattering (SRS) of weak-gain Raman modes in pendant drops is accomplished by overlapping Stokes wavelengths of the Raman modes with the Rhodamine 640 dye-lasing gain region (called the gain-overlap method). The dye concentration and the pumping intensity of frequencydoubled Nd: YAG lasers determine the efficiency of the enhancement. We apply the gain-overlap technique at optimal dye concentration and pump intensity to probe minority species in pendant drops formed by binary mixtures. The limits of detectable concentrations of the minority species, methanol in methanol-ethanol and ethanol in ethanol-water (dye-doped) mixtures, are much less than those in undoped mixtures. The smooth fluorescence-lasing spectral curves emitted from dye-doped pendant drops reduce complications in distinguishing SRS signals from quasi-periodic fluorescence-lasing spectra in microdroplets.
-
31浏览
-
0点赞
-
0收藏
-
0分享
-
82下载
-
0评论
-
引用
【期刊论文】LASING FROM A DYE-DOPED PENDANT DROP AND ITS PRECESSION
普小云, Pu XIAO-YUN (普小云) a)b) and LEE WING-KEE (李荣基) b)
,-0001,():
-1年11月30日
We have observed lasing from the rim of dye-doped ethylene glycol pendant drops. Sptatial-resolved spectral measurements show that the lasing wavelength varies along a vertical rim of the drop. Time-resolved measurements indicate that lasing precession occurs within the drop. Various lasing patterns due to lasing precession are explained. The measured precession periods for different pumping points are in good agreement with the calculated values based on morphology-dependent resonance theory.
pendant drop,, lasing precession,, red shift
-
35浏览
-
0点赞
-
0收藏
-
0分享
-
68下载
-
0评论
-
引用
【期刊论文】Reduction of Lasing Threshold by Deforming a Circular Resonator*
普小云, PU Xiao-Yun (普小云), , XIA Yun-Jie (夏英杰), LEE Wing-Kee (李荣基)
,-0001,():
-1年11月30日
We have reduced the lasing threshold of a circular resonator, formed by a dye-doped pendant drop, by changing its shape from a circle to an oval. This phenomenon can be explained by the decrease of the number (p) of modes that support lasing in the resonator. A theory that connects wave and ray pictures in dealing with the cavity resonance is used to estimate p and its dependence on the eccentricity of an oval-shaped resonator. The measured lasing threshold and the calculated p have a linear relationship in agreement with our prediction.
-
47浏览
-
0点赞
-
0收藏
-
0分享
-
74下载
-
0评论
-
引用
普小云, X. Y. PU* and N. H. CHEUNG†
,-0001,():
-1年11月30日
Laser-induced breakdown spectroscopy, ArF laser ablation, Plasma reheating, Lead, Aqueous samples.,
-
69浏览
-
0点赞
-
0收藏
-
0分享
-
77下载
-
0评论
-
引用
【期刊论文】Sensitive elemental analysis of aqueous colloids by laser-induced plasma spectroscopy
普小云, X. Y. Pu, a) W. Y. Ma, b) and N. H. Cheung c)
,-0001,():
-1年11月30日
Highly sensitive elemental analysis of lead carbonate colloids was demonstrated by two-pulse laser-induced plasma spectroscopy. The first laser pulse created a vapor plume with the particulates concentrated in space because of their slower propagation. They were then ablated by an ArF laser pulse that efficiently atomized and excited the lead analyte. The lead emissions were much enhanced, while the background continuum interference was minimized. The detection limit for lead was shown to be 14.2 ppb, compared with 13 ppm achieved by conventional laser-induced breakdown spectroscopy of lead ions in water and 210 ppb for lead aerosols.
-
72浏览
-
0点赞
-
0收藏
-
0分享
-
105下载
-
0评论
-
引用