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辅助光对NaCl(OH-)和KCl(Na+,OH-)晶体中的类F2+型色心激光输出的影响 总被引:1,自引:1,他引:0
文中报进了有关辅助光对NaCl(OH-):(F2+)H及KCl(Na+,OH-):(F2+)AH色心激光输出功率影响的主要研究结果。初步探讨了辅助光作用的物理机制。 相似文献
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用阻抗匹配法和PZT压电探针技术,在100 GPa的冲击压力范围内测量了初始密度分别为1.375 g/cm3和2.001 g/cm3两种孔隙度叙永石样品的Hugoniot状态方程。根据其pH-ρH线所给出的高温高压相变点,用Grüneisen状态方程计算其相变点压力所对应的温度,并结合常压下受热相变的温度值,建立了“高岭石/Al2O3+SiO2+H2O”的温度-压力相平衡图。通过该相图与线性地热线的交点推断:高岭石至少可在上地幔50 km深处作为一种含水(OH-)矿物而稳定存在;或在俯冲板块中至少于133 km深处作为一种含水(OH-)泥质沉积物的过渡相而存在。 相似文献
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提出了一种亚层子模型. 层子和轻子是由rishon T和V组成的. T和V是SUH(3)×SUC(3)×SUG(2)×U(1)群的多重态. 由这些多重态可以自然地得到三代层子和轻子. 在此模型中质子衰变为μ-e+e+或e-μ+μ+. 相似文献
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Motivated by the rst measurement on B(Bs→φμ+μ-) by the CDF Collaboration, we study the supersymmetric e ects in semi-leptonic Bs→φμ+μ- decay. In our evaluations, we analyze the dependences of the dimuon invariant mass spectrum and the forward-backward asymmetry on relevant supersymmetric couplings in the MSSM with and without R-parity. The analyses show that the new experimental upper limits of B(Bs→φμ+μ-)from the LHCb Collaboration could further improve the bounds on sneutrino exchange couplings and (δLLu)23 as well as (δLL,RRu)23 mass insertion couplings. In addition, within the allowed ranges of relevant couplings under the constraints from B(Bs→φμ+μ-), B(B→K(*)μ+μ-) and (Bs→φμ+μ-), the dimuon forward-backward asymmetry and the di erential dimuon forward-backward asymmetry of Bs→φμ+μ-are highly sensitive to the squark exchange contribution and the (δLLu)23 mass insertion contribution. The results obtained in this work will be very useful in searching for supersymmetric signals at the LHC. 相似文献
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Fe:LiNbO3全息图热定影及H+浓度的影响 总被引:4,自引:4,他引:0
应用光折变效应动力学方程,导出了在Fe:LiNbO3中对光折变全息图热定影所需的最小H+浓度,以及H+浓度与光栅空间频率的关系.应用光谱比较法测量了不同样品的H+浓度值.得出了进行有效热定影的H+浓度范围.完成了Fe:LiNbO3全息存储和热定影实验.获得了100h连续无损读出的良好热定影实验结果. 相似文献
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In this paper we study the semileptonic decays of Bc-→(ηc,J/Ψ)l-vl. We first evaluate the Bc→(ηc,J/Ψ) transition form factors F0(q2), F+(q2), V(q2) and A0,1,2(q2) by employing the pQCD factorization approach, and then we calculate the branching ratios for all considered semileptonic decays. Based on the numerical results and the phenomenological analysis, we find that: (a) the pQCD predictions for the values of the Bc→ηc and Bc→J/Ψ transition form factors agree well with those obtained by using other methods; (b) the pQCD predictions for the branching ratios of the considered decays are Br(Bc-→ηc e-ve(μ-vμ)=(4.41-1.09+1.22)×10-3, Br(Bc-→ηcτ-vτ) =(1.37-0.34+0.37)×10-3, Br(Bc-→J/Ψ e-ve(μ-vμ)) =(10.03-1.18+1.33)×10-3, and Br(Bc-→J/Ψτ-vτ) =(2.92-0.34+0.40)×10-3; and (c) we also define and calculate two ratios of the branching ratios Rηc and RJ/Ψ, which will be tested by LHCb and the forthcoming Super-B experiments. 相似文献
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Using data samples collected at center-of-mass energies of √s=4.009, 4.230, 4.260, and 4.360 GeV with the BES0 detector operating at the BEPC/ collider, we perform a search for the process e+e-→γχc,j (J =0, 1, 2) and find evidence for e+e-→γχc1 and e+e-→γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e-→γχc,j), as well as their upper limits at the 90% con dence level (C.L.) are determined at each center-of-mass energy. 相似文献
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3 are fabricated by both a proton exchange and a successive copper exchange. The influence of different fabrication steps on
the refractive index profile and optical absorption is investigated. The holographic efficiency is determined together with
the dark- and photo-conductivity. We show that the photorefractive properties of proton-exchanged LiTaO3 waveguides are considerably improved by the additional copper exchange. It is established that the holographic efficiency
depends on the copper content, the phase of the proton-exchanged layer and the light intensity.
Received: 3 March 1997 相似文献
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A proton-exchanged LiNbO3 crystal was subjected to 70-MeV argon-ion irradiation.The lattice damage was investigated by the Rutherford backscattering and channeling technique.It was found that the lattice disorder induced by the proton exchange process was partially recovered and the proton-exchanged layer was broadened.It indicated that the lithium ions underneath the initial proton-exchanged layer migrated to the surface during the swift argon-ion irradiation and supplemented the lack of lithium ions in the initial proton-exchanged layer.This effect was ascribed to the great electronic energy deposition and relaxation.The swift argon-ion irradiation induced an increase in extraordinary refractive index and formed another waveguide structure beneath the proton-exchanged waveguide. 相似文献
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A proton-exchanged LiNbO3 crystal was subjected to 70-MeV argon-ion irradiation.The lattice damage was investigated by the Rutherford backscattering and channeling technique.It was found that the lattice disorder induced by the proton exchange process was partially recovered and the proton-exchanged layer was broadened.It indicated that the lithium ions underneath the initial proton-exchanged layer migrated to the surface during the swift argon-ion irradiation and supplemented the lack of lithium ions in the initial proton-exchanged layer.This effect was ascribed to the great electronic energy deposition and relaxation.The swift argon-ion irradiation induced an increase in extraordinary refractive index and formed another waveguide structure beneath the proton-exchanged waveguide. 相似文献
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本文报道了利用红外光谱技术测量质子交换LiNbO3光波导浓度的一种新方法。该方法克服了传统的棱镜耦合技术+IWKB方法只适用于多模波导不适用于单模波导缺点。实验结果表明该方法具有较好的准确性。 相似文献
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Wei Jun Liao Xianfeng Chen Fucheng Chen Yuping Chen Yuxing Xia Yingli Chen 《Optics & Laser Technology》2004,36(8):603-606
In this paper, we first report that a new proton source, glutaric acid, has been used to fabricate optical waveguides in Z-cut lithium niobate crystals. The relationship was experimentally established between proton-exchanged (PE) waveguide parameters and fabrication conditions. It is shown that this new organic acid can be used to obtain deep PE waveguides in fast diffusion speed (0.275 μm2/h at 221°C) and with low loss (0.2 dB/cm). It provides an alternative approach for fabricating PE waveguides in lithium niobate substrate. 相似文献
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本文报道了利用红外光谱技术测量质子交换LiNbO3 光波导深度的一种新方法。该方法克服了传统的棱镜耦合技术 +IWKB方法只适用于多模波导不适用于单模波导缺点。实验结果表明该方法具有较好的准确性。 相似文献
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A simple fabrication method of self-aligned ridge waveguides with dielectric side buffers is demonstrated on +Z-cut LiNbO3. The ridge waveguide is fabricated by a combination of the annealed proton exchange process and the proton-exchanged wet etching technique. 相似文献
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I. Savatinova S. Tonchev E. Liarokapis M.N. Armenise M. Armenise 《Applied Physics A: Materials Science & Processing》1999,68(4):483-487
3 waveguides is demonstrated by the Raman scattering technique. Multimode waveguides have been produced by using pyrophosphoric,
benzoic, and diluted benzoic acids as a proton source. The proton-exchanged (PE) layers are subjected to annealing (APE samples)
with different rates of cooling: slow (s) and quick (q). The effect of Li-H replacing is considered in the frequency range
below 800 cm-1 and about 3500 cm-1 (OH modes). The analysis of the spectral data leads to some important conclusions about the changes in the H:LiNbO3 lattice. We demonstrate that applying (s) ? (q) procedures on HxLi1-xNbO3 waveguides with x>0.56 leads to phase transitions between different states. The high-temperature phase modifications (metastable
at room temperature) are characterized by strongly broadened q-Raman bands which imply a high degree of disorder. Although
the Raman measurements support the presence of different phases in H:LiNbO3 waveguides, some conclusions, different from those reported elsewhere, have been made.
Received: 16 November 1998 / Accepted: 14 December 1998 / Published online: 24 February 1999 相似文献