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Extended Measurement of the v2 (1- ←0+) Band of H3O+ by Mid-Infrared Diode Laser Spectroscopy 下载免费PDF全文
Twenty-five new R-branch lines of the v2(1^-← 0^+) band of H3O^+ are measured using diode laser velocity modulation spectroscopy between 1070 and 1230 cm^-1. The H3O^+ ions are produced in a high voltage ac discharge with water diluted in helium. The observed lines together with all the previously published measurements are fit to the standard vibration-rotational Hamiltonian of an oblate symmetric top, yielding a set of improved molecular constants. All the sextic centrifugal distortion constants for both 0^+ and 1^- states are determined precisely. The observed R(13, 0) transition is shifted about -0.129 cm^-1 from its calculated value, indicating that a near degeneracy exists between the (13, 0)^+ and (13, 3)^- ground-state rotation-inversion levels. 相似文献
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介绍了一种新型增益导引-折射率反导引大模场光纤的结构、基本理论以及其在光纤激光器领域的重要应用. 在综合分析了不同抽运条件下的激光输出特性以及光纤的热效应特征后, 得出侧面抽运是增益导引-折射率反导引大模场光纤的最佳抽运方案的结论; 重点介绍了增益导引-折射率反导引大模场光纤侧面抽运的理论模拟以及基于V形槽技术的侧面抽运实验研究过程, 为相关领域的实验研究提供了参考; 最后分析了实验结果与理论差距较大的原因, 并提出了改进的方向. 相似文献
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测定了新型光功能有机材料锌 四苯并卟吩 巴豆酸 苯氧树脂 (Zn Tetrabenzoporphin CrotonicAcid/PhenoxyResin ,简称ZnTBP/CA/PhR)体系薄膜样品在可见光范围内的吸收谱 ,定点测量了其主要吸收谱带在激光作用下的变化情况 ,实验观察到此种材料显著的饱和及反饱和吸收现象 ,还首次观察到它的再反饱和过程。文章定性分析了变化过程中的物理机制 ,讨论了ZnTBP/CA/PhR的非线性吸收特性在光子学领域的一些应用 相似文献
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Planar waveguides in neodymium-doped calcium niobium gallium garnet crystals produced by proton implantation 下载免费PDF全文
In this work, the fabrication and optical properties of a planar waveguide in a neodymium-doped calcium niobium gallium garnet(Nd:CNGG) crystal are reported. The waveguide is produced by proton(H~+) implantation at 480 ke V and a fluence of 1.0×10~(17) ions/cm~2. The prism-coupling measurement is performed to obtain the dark mode of the waveguide at a wavelength of 632.8nm. The reflectivity calculation method(RCM) is used to reconstruct the refractive index profile. The finite-difference beam propagation method(FD-BPM) is employed to calculate the guided mode profile of the waveguide.The stopping and range of ions in matter 2010(SRIM 2010) code is used to simulate the damage profile induced by the ion implantation. The experimental and theoretical results indicate that the waveguide can confine the light propagation. 相似文献
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This paper reports that the absorption spectra of H2O^+ have been measured by tunable mid-infrared diode laser spectroscopy in the spectral range of 1100-1380 cm^-1. The H2O+ ions are generated in an AC glow discharge of the gaseous mixtures of H2O/He and detected with the velocity modulation technique. Forty new lines are assigned to the ν2 fundamental band of H2O^+ (X^2B1). The observed lines together with other data published previously are fitted to the standard effective Hamiltonian of an asymmetric top, yielding a set of improved rotational constants, spin-rotation constants and their quartic and sextic centrifugal distortion constants for the ν2=1 vibrational state of H2O+. 相似文献
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Infrared diode laser spectroscopy of O2–N2O van der Waals complex in the ν1 symmetric stretch region of N2O 下载免费PDF全文
The rovibrational spectrum of O2–N2O van der Waals complex is measured in the v1 symmetric stretch region of N2O monomer using a tunable diode laser spectrometer. The complex is generated by a slit-pulsed supersonic expansion with gas mixtures of O2, N2O, and He. Both a- and b-type transitions are observed. The effective Hamiltonian for an open-shell complex consisting of a diatomic molecule in a 3Σ electronic state and a closed-shell partner is used to analyze the observed spectrum. Molecular constants in the vibrationally excited state are determined accurately. The band-origin of the spectrum is determined to be 1284.7504(25) cm-1, red-shifted from that of the N2O monomer by ~ 0.1529 cm-1. 相似文献
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A PVK—Based High—Performance Photorefractive Polymer Composite Under a Low External Electric Field 总被引:1,自引:0,他引:1 下载免费PDF全文
We describe a PVK-based photorefractive polymer composite doped with disperse red 1,poly-butylacrylate and TNF.Using the two-beam coupling experiment,we investigate its photorefractive properties as well as the dynamic process of the index gratings in the sample.We observe the photorefractive effect in the absence of an applied external electric field.The two-beam coupling gain coefficient was measured to reach a value as high as 140cm^-1 in the absence of an external applied electric field and a value of 470cm^-1 at a poling dc electric field of 25V/μm. 相似文献