共查询到20条相似文献,搜索用时 93 毫秒
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本文介绍了TiF6光学玻璃的制作。研究了这种玻璃内的K+或Na+离子与Ag+离子交换。使用双光束干涉法观测了干涉纹、并用电子探针扫描电镜测量了Ag+、K+和Na+离子的浓度分布,还着重研究了离子交换后的玻璃裂纹和着色问题。最后,对结果作了讨论。 相似文献
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本文应用复合粒子量子场论的微扰展开式和相对论性的(π&;#177;μ?)、(K&;#177;μ?)的B.S.波函数,计算了在原子核屏蔽库仑场中高能(π&;#177;μ?)、(K&;#177;μ?)原子的裂解能谱和截面。在极端相对论近似下,对大多数原子核,它们的裂解截面分别约为10-18cm2和10-17cm2。利用同样的波函数,还计算了(π&;#177;μ?)→π0+vμ(vμ),(K&;#177;μ?)→K0+vμ(vμ),以及(π&;#177;μ?)→μ++μ-+vμ(vμ),(K&;#177;μ?)→μ++μ-+vμ(vμ)的衰变几率。 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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本文先用 Green 函数方法证明非相对论量子力学中的 Levinson 定理有如下形式:nl=1/π[δl(0)—δl(∞)]—((—1)l)/2 sin2δl(0),然后导出了它在 Dirac 方程中的推广形式为:nk+—nk-=1/π[δk(m)—δk(∞)+δk(—∞)—δk(—m)]—(k/(|k|))((—1)x/2)[sin2δk(m)+sin2δk(—m)].对于 Klein-Gordon 方程,则可以有两种形式:nl+±nl-=1/π{δl(m)—δl(∞)±[δl(—m)—δl(—∞)]}—((—1)l/2)[sin2δl(m)±sin2δl(—m)].文中对此定理的含义、应用范围及有关问题作了讨论,并就方势阱的 s 态问题,检验了这些公式。 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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本文提出了一个对称性破缺前不仅左、右对称, 而且中微子(或反中微子)与荷电轻子、反轻子的弱作用也相同的SU(3)×U(1)模型. 这一模型无三角反常; 导出了sin2θw≤1/4; 在低能范围内与标准模型一致. 我们反轻子数推广为轻子荷. 证明了只有轻子荷才是严格守恒的, 各代轻子数分别守恒只能近似成立. 夸克不仅带有重子数、电荷, 而且也带有轻子荷. 本模型预言有μR→eR+νeL+νμR, e-+e-→μ-+μ-等现象. 相似文献
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Low-loss waveguides written with a femtosecond laser for flexible interconnection in a planar light-wave circuit 总被引:3,自引:0,他引:3
We describe a low-loss single-mode waveguide in planar light-wave circuit (PLC) glass doped with boron and phosphorus, which is more difficult to write than pure-silica glass. The written waveguide has a rectangular core, a symmetric near-field pattern, and a propagation loss of 0.35 dB/cm. The loss that originates from the mode-field mismatch between the mode-field diameters of the written and the PLC waveguides is less than 0.1 dB/point. In addition, we successfully connected PLC waveguides with a 500-microm-long waveguide written with a laser. The laser-written waveguide can flexibly connect PLC waveguides with a low coupling loss. 相似文献
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Kin Seng Chiang 《光学学报》2003,23(Z1)
Our progress in the study of long-period gratings (LPGs) in planar optical waveguides is reviewed. In particular,experimental LPGs in glass and polymer waveguides are presented to demonstrate the potential of LPG-based waveguide devices. 相似文献
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通过K-Na离子交换技术制备了多模玻璃平面波导.采用棱镜耦合技术测量了波导的有效折射率,用IWKB方法拟合得到K-Na离子交换波导的折射率分布符合高斯分布,由色散曲线得到单模波导的制备条件(即扩散深度范围),从而得出单模波导的离子交换时间范围,制备出单模波导,并通过求解WKB色散方程得出单模波导的表面折射率.用普通数码相机,通过对离子交换平面玻璃光波导传输线进行数字成像,根据传输线上的光强分布拟合出光强传输衰减曲线,计算出单模波导的传输损耗大约为0.4 dB/cm. 相似文献
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Surface corrosion of phosphate glass during ion-exchange processing for optical waveguide fabrication is studied, and a protection method by using BK7 glass film is proposed and demonstrated in this paper. The protection coating processing is described and optical microscope and atomic force microscope observations are presented. Characteristics of the planar waveguide were measured also to show the protection coating would not introduce influence to waveguide formation in the phosphate glass. Experimental results show that the method can serve an effective protection, and will improve the performance of rare-earth-doped active phosphate glass optical waveguides. 相似文献
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Modelling of surface plasmon resonance waveguide sensor by complex mode expansion and propagation method 总被引:1,自引:0,他引:1
Light propagation in a surface plasmon resonance sensor based on a planar glass ion-exchanged waveguide covered with a thin
gold layer is modelled using the eigenmode propagation and matching technique. Optical field distribution along the sensor
and the dependence of the transmitted power on the refractive index of the sensed medium is calculated. Experimental results
obtained with K+↔Na+ ion-exchanged waveguides are also reported.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
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用极坐标下的广角光束传播法计算分析弯曲波导 总被引:2,自引:0,他引:2
采用了极坐标下的广角BPM(Beam Propagation Method)对弯曲波导进行了计算模拟,并与极坐标下近轴BPM方法进行了比较,取得很好的结果. 相似文献
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Optical planar waveguides in Yb<sup>3+</sup>-doped phosphate glasses produced by He<sup>+</sup> ion implantation 下载免费PDF全文
Optical planar waveguides in Yb 3+-doped phosphate glasses are fabricated by implanting triple-energy helium ions. The guiding modes and the near-field intensity distribution are measured by using the prism-coupling method and the end-face coupling setup with a He-Ne laser at 633 nm The intensity calculation method (ICM) is used to reconstruct the refractive index profile of the waveguide. The absorption and the fluorescence investigations reveal that the glass bulk features are well preserved in the active volumes of the waveguides, suggesting the fabricated structures for possible applications as waveguide lasers. 相似文献
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Accurate semi-analytical technique is developed for reconstructing refractive index profiles of optical waveguide by near-field pattern. The approach is shown to be effective for the synthesis of single-mode waveguides. Optimising profiles of planar waveguides for managing power distribution of propagating waves is demonstrated. 相似文献