A Highly Efficient SHG in CPM, Nd∶YAG/LBO Laser

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｅｎｓｅｐｉｃｏｓｅｃｏｎｄｐｕｌｓｅｓｉｎｄｉｆｅｒｅｎｔｗａｖｅｌｅｎｇｔｈｓａｒｅｓｔｒｏｎｇｌｙｒｅｑｕｉｒｅｄｆｏｒｍａｎｙａｐｐｌｉｃａｔｉｏｎｓ．Ｔｈｅｔｅｃｈｎｉｑｕｅｏｆｓｅｃｏｎｄｈａｒｍｏｎｉｃｇ...     

Electron Impact Ionization Cross Section for Excited State of Ne like Ions in Detailed Configuration

１ＩｎｔｒｏｄｕｃｔｉｏｎＥｌｅｃｔｒｏｎｉｏｎｃｏｌｉｓｉｏｎｉｏｎｉｚａｔｉｏｎｉｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｐｒｏｃｅｓｅｓｉｎａｔｏｍｉｃｐｈｙｓｉｃｓ．Ｔｈｅｉｏｎｉｚａｔｉｏｎｃｒｏｓｓｅｃｔｉｏｎｓａｒｅｖｅｒｙｉｍｐ...     

Laser Induced Damage in CVD Diamond Films

ＬａｓｅｒＩｎｄｕｃｅｄＤａｍａｇｅｉｎＣＶＤＤｉａｍｏｎｄＦｉｌｍｓＱＩＵＨｏｎｇＦＡＮＺｈｅｎｇｘｉｕ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｐ．Ｏ．...     

Amorphous Structures in Laser Cladding of ZL111 Aluminum Alloy:Semi-quantitative Study by Differential Thermal Analysis (DTA)

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｌａｓｅｒｃｌａｄｄｉｎｇｐｒｏｃｅｓｓｉｓｔｏｄｅｐｏｓｉｔａｐｒｏｔｅｃｔｉｖｅｌａｙｅｒｏｎｔｏａｗｏｒｋｐｉｅｃｅ．Ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｌａｓｅｒｃｌａｄｄｉｎｇｃａｎｂｅｃｏｎｓｉｄｅｒｅｄｉｎｔ?..     

Beam Propagation Factor and Generation of Cosh-squared-Gaussian Beams

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｒｅｃｅｎｔｌｙ ,Ｃａｓｐｅｒｓｏｎ ｅｔａｌ.[1,2 ]ｒｅｐｒｅｓｅｎｔｅｄａｓｏ ｃａｌｌｅｄＨｅｒｍｉｔｅ ｓｉｎｕｓｏｉｄａｌ Ｇａｕｓｓｉａｎｂｅａｍｓ (ＨＳＧＢｓ)ａｎｄ ｐｒｏｖｅｄｔｈａｔｔｈｅｙａｒｅｓｔｉｌｌｓｏｌｕｔｉｏｎｓｏｆｔｈｅｗａｖｅｅｑｕａｔｉｏｎｕｎｄｅｒｔｈｅ ｐａｒａｘｉａｌａｐｐｒｏｘｉｍａｔｉｏｎａｎｄｔｈｅｉｒｃｏｍｐｌｅｘｒａｄｉｕｓｏｆｃｕｒｖａｔｕｒｅａｎｄｍｅａｎｒａｙｐａｒａｍｅｔｅｒｓｏｂｅｙｔｈｅｗｅｌｌ ｋｎｏｗｎＡ…     

Characteristics of High Harmonics Generated in a Gas Filled Microcapillary

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　ＨｉｇｈｏｒｄｅｒｈａｒｍｏｎｉｃｅｍｉｓｓｉｏｎｏｆｇａｓａｔｏｍｉｎｔｅｒａｃｔｉｏｎｗｉｔｈｉｎｔｅｎｓｅｌａｓｅｒｆｉｅｌｄｉｓａｐｒｏｍｉｓｉｎｇｍｅｔｈｏｄｔｏｐｒｏｄｕｃｅａｃｏｈｅｒｅｎｔｕｌｔｒａｖｉｏｌｅｔａｎｄｓｏｆｔＸｒａｙｓｏｕｒｃｅ．Ｓｉｎｃｅｔｈｅｆｉｒｓｔｅｘｐｅｒｉｍｅｎｔａｌｏｂｓｅｒｖａｔｉｏｎｏｆｔｈｅｈｉｇｈｏｒｄｅｒｈａｒｍｏｎｉｃｅｍｉｓｓｉｏｎｏｆｒａｒｅｇａｓｅｓｅｘｐｏｓｅｄｔｏｉｎｔｅｎｓｅｌａｓｅ…     

A Quick Numerical Method for Analyzing Nonlinear Effects of Excited State Absorption

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｗｈｅｎｕｌｔｒａｓｈｏｒｔ,ｈｉｇｈｉｎｔｅｎｓｉｔｙｌａｓｅｒｐｕｌｓｅｓｉｎｔｅｒａｃｔｗｉｔｈａｍｕｌｔｉｅｎｅｒｇｙｌｅｖｅｌｍｏｌｅｃｕｌａｒｓｙｓｔｅｍ,ｔｈｅｂｕｉｌｄｕｐｏｆｐｏｐｕｌａｔｉｏｎｉｎｅｘｃｉｔｅｄｓｔａｔｅｓｗｉｌｌｌｅａｄｓｔｏａｒｅｄｕｃｔｉｏｎｏｒａｎｉｎｃｒｅａｓｅｏｆｔｈｅａｂｓｏｒｐｔｉｏｎｃｏｅｆｆｉｃｉｅｎｔ,ｗｈｉｃｈａｒｅｒｅｆｅｒｒｅｄｔｏａｓｓａｔｕｒａｂｌｅａｂｓｏｒｐｔｉｏｎ（ＳＡ,ｉ．ｅ．,ａｎ…     

Study of RF Excited CO 2 Waveguide Laser Array

Ｉｎｔｒｏｄｕｃｔｉｏｎ　　ＴｈｅＲＦｅｘｃｉｔｅｄｔｅｃｈｎｉｑｕｅｔｏＣＯ２ｗａｖｅｇｕｉｄｅｌａｓｅｒｈａｓｂｅｅｎｒａｐｉｄｌｙｉｍｐｒｏｖｅｄ．ＭａｎｙｎｅｗｓｔｒｕｃｔｕｒｅｓｈａｓａｐｐｅａｒｅｄｓｉｎｃｅＫ．Ｄ．Ｌａａｋｍａｎ［１］ｍａｄｅｆｉｒｓｔｌｙｏｕｔｔｒａｎｓｖｅｒｓｅｅｘｃｉｔｅｄｗａｖｅｇｕｉｄｅＣＯ２ｌａｓｅｒｆｉｒｓｔｉｎ１９７７,ｓｕｃｈａｓｃｏｈｅｒｅｎｔｐｈａｓｅｌｏｃｋｅｄ１×２ａｒｒａｙＣＯ２ｗａｖｅｇｕｉｄｅｌａｓｅｒｇｉｖｅｎｂｙＤ．Ｇ．Ｙｏｕｍ…     

评述文章扫描(英文)

１ＴｈｅｏｒｙｏｆＢｏｓｅ－Ｅｉｎｓｔｅｉｎｃｏｎｄｅｎｓａｔｉｏｎｉｎｔｒａｐｐｅｄｇａｓｅｓ（ＦｒａｎｃｏＤａｌｆｏｖｏ,ＳｔｅｆａｎｏＧｉｏｒｇｉｎｉ,ＬｅｖＰ．Ｐｉｔａｅｖｓｋｉｉｅｔａｌ．Ｒｅｖ．Ｍｏｄ．Ｐｈｙｓ．,１９９９,７１：４６３—５１２）２Ｔｏｐ－ｑｕａｒｋｃｏｎｄｅｎｓａｔｉｏｎ（Ｇ．Ｃｖｅｔｉｃ．Ｒｅｖ．Ｍｏｄ．Ｐｈｙｓ．,１９９９,７１：５１３—５７４）３ＰｒｅｃｉｓｉｏｎｔｅｓｔｓｏｆｔｈｅｅｌｅｃｔｒｏｗｅａｋｉｎｔｅｒａｃｔｉｏｎａｔｔｈｅＺｐｏｌｅ（Ｍ．Ｍａｒｔ…     

Experimental Study on Stable 10 GHz Actively Mode locked Fiber Ring LaserSupported by the National Natural Science Foundation of China (No. 69738010) and the High Technology Research and Development Program of China.

１ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｄｅｌｏｃｋｅｄｆｉｂｅｒｌａｓｅｒｓａｒｅｔｈｅａｔｒａｃｔｉｖｅｓｏｕｒｃｅｓｏｆｕｌｔｒａｓｈｏｒｔｏｐｔｉｃａｌｐｕｌｓｅｓａｔｔｈｅｃｏｍｍｕｎｉｃａｔｉｏｎｗａｖｅｌｅｎｇｔｈｏｆ１．５５μｍｂｅｃａｕｓ...     

The Resonance Peak Theory of Reflection Guided-mode Resonance Filters

In this paper, the physical principle of phase grating's resonance is discussed and the basic (approximate) formulae for the resonance is presented. According to the formulae, the properties of resonance peak, including the condition for multi-peak and single-peak, its relation with grating film thickness, incidence angle, and grating period, is also discussed. The results are consistent with those calculated with rigorous theory. An efficient design method for controlling the single-peak resonance wavelength is found.     

表面镀层长周期光纤光栅双峰谐振及其透射谱研究

采用严格的耦合模理论,通过求解表面镀层长周期光纤光栅的特征方程,给出了双峰谐振波长的确定方法,以及它与光栅周期和模式序数之间的关系。结果表明,对应于较高次的包层模式,存在双峰谐振现象,且包层模式序数越高,与芯模产生谐振耦合所需的光栅周期越小。进一步讨论了双峰谐振波长的间距随薄膜参量与光栅参量变化的关系,描绘了这些参量对透射谱衰减谐振峰的影响,理论分析结果与X.W.Shu的无镀层长周期光纤光栅实验结果一致。这些研究为建立高灵敏的双峰谐振薄膜传感器提供了结构优化的理论支持。     

亚波长介质光栅导模共振研究

从平板波导的本征值方程出发,导出弱调制介质光栅共振位置的表达式,其预测结果与利用严格的耦合波理论所得值一致.对正入射时导模共振产生双反射峰现象进行解释,并就导模共振对入射角和光栅周期敏感性的成因进行了探讨.从薄膜的特征矩阵方程出发,在理论上分析了利用导模共振获得性能良好的反射滤光片的途径.     

Resonance investigations in the framework of a unified theory of nuclei

Within a unified theory of nuclei, resonance formulae are derived which are valid for every kind of bombarding particles and which contain the possible influence of direct reactions. The formulae are discussed from the viewpoint of parametrization of experimental results. Moreover, the influence of penetration effects on resonance reactions is discussed and illustrated by results of quantitative calculations.     

基于导模共振的窄带可调谐滤波器

提出了一种分离的导模共振滤波器.该结构由光栅层和两个被空气薄层隔开的平板介质波导组成.使用时域有限差分法分析了该光栅结构在不同的结构参数下的光谱特性.研究表明,当TM偏振入射时改变空气薄层的厚度可以实现共振波长的可调谐,并且共振波长几乎随着空气薄层厚度线性变化.浅调制光栅被用于实现窄线宽特性.波长可调谐范围为1 515~1 558nm,半高全宽小于0.6nm.     

基于双峰谐振效应的镀金属长周期光纤光栅液体浓度传感器

利用长周期光纤光栅(LPFG)中的双峰谐振效应,结合表面等离子体共振(SPR)传感器的高灵敏度,提出了一种新型镀金属光纤光栅液体浓度传感器.采用双包层结构模型和耦合模理论,分析r镀金属长周期光纤光栅双峰效应的谐振特性,环境折射率的传感特性以及金属膜厚对双峰LPFG灵敏度的影响.实验上制作了具有双峰效应的镀银膜长周期光纤...     

Extraordinary Acoustic Transmission in a Helmholtz Resonance Cavity-Constructed Acoustic Grating

We investigate both experimentally and numerically a complex structure,where 'face-to-face' Helmholtz resonance cavities(HRCs) are introduced to construct a one-dimensional acoustic grating.In this system,pairs of HRCs can intensely couple with each other in two forms:a bonding state and an anti-bonding state,analogous to the character of hydrogen molecule with two atoms due to the interference of wave functions of sound among the acoustic local-resonating structures.The bonding state is a 'bright' state that interferes with the Fabry-Perot resonance mode,thereby causing this state to break up into two modes as the splitting of the extraordinary acoustic transmission peak.On the contrary,the anti-bonding state is a 'dark' state in which the resonance mode remains entirely localized within the HRCs,and has no contribution to the acoustic transmission.     

表面覆膜波导光栅共振光谱特性及传感机理分析

基于波导光栅共振原理和古斯-汉欣(Goos-Hänchen)位移理论,提出一种表面覆膜波导光栅传感结构,并研究其共振光谱特性。通过在光栅表面涂覆低折射率聚合物功能膜层优化其共振光谱特性,选用多孔硅作为待测物承载单元,可以使光学探针更充分地接触待测样本,从而提高其检测性能。根据波导光栅共振相位条件,建立了共振波长和样本折射率之间的数学模型,通过检测共振位置的改变进而对样本浓度进行检测。研究表明,该表面覆膜波导光栅传感结构具有线型对称和窄线宽的共振光谱特性,可实现高品质因数(Q值)和高灵敏度的传感特性,其Q值为1 488,对折射率的检测极限可达5×10-4 RIU(RIU为折射率单位)。通过检测不同浓度的葡萄糖溶液对其传感特性进行验证分析,结果表明,共振波长与葡萄糖溶液浓度之间具有良好的线性关系,对葡萄糖溶液的检测灵敏度为1.12nm/1%,证明了该表面覆膜波导光栅传感结构的有效性,可以用于对低浓度样本溶液的实时动态监测,并为波长调制型光学折射率传感器的研究提供理论指导。     

Guided-mode resonance in curved grating structures

The guided-mode resonance phenomenon in curved grating structures was studied. By using finite-difference time-domain simulation in the cylindrical coordinate system, we investigated the dependence of the peak reflectivity and bandwidth of the resonance upon the curvature radius. We clarified that the reflectivity and bandwidth were similar to those of flat grating structures for a finite range of curvature. We also discussed the key factor that determines the performance of reflection.     

兔红细胞的共振散射光谱研究

研究了液相兔血红细胞的共振散射光谱 (RSS)及非线性分频散射和倍频散射。兔红细胞浓度在0 0 15～ 31 1× 10 6个·(mL) -1范围与共振散射光强度成线性关系。对非线性散射机理进行了探讨。