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共焦非稳腔中ps激光的内腔倍频 总被引:2,自引:1,他引:1
考虑倍频晶体相位匹配接收角(Angular acceptance)对倍频转换效率的影响,设计了正支(p支)共焦非稳腔Nd:YAP锁模激光器。平行光通过晶体实现完全相位匹配。以BBO和KTP作为腔内倍频元件,分别获得80.6%和60.2%的高效倍频转换,及几十mJ的绿光输出。同时实验测定其它有关参数。 相似文献
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Si nano-composites were precipitated on LiF crystals following ablation from Si targets with laser light at 157 nm. The LiF/Si interface was analyzed with scanning electron microscopy, atomic force microscopy and energy dispersive X-ray microanalysis. It was found that Si composites were strongly attached to LiF ionic sites to form inhomogeneous structures consisted of small isotropic crystals 0.1-1 μm long, rich in Si and fluorine, which eventually further agglomerate to form larger structures. The thickness of the LiF/Si interface was increased from 50 nm to 2 μm following laser irradiation at 157 nm, due to accelerated adsorption of Si in the LiF interface by VUV light. 相似文献
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利用超快速时间分辨光谱研究了蓝绿藻藻胆体的2个变藻蓝发射终端(APB,API)单体和三聚体内的能量传递过程,探测到APB和API单体的两组亚基α^AP/β^AP和α^APB/β^AP间的能量传递时间常数分别为30ps和194ps。APB和API三聚体所共有的9-32ps的短寿命组分来源于同一单体内能量由α^AP向βAP的传递过程。 相似文献
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该文研究了如下的奇异椭圆方程Neumann问题$\left\{\begin{array}{ll}\disp -\Delta u-\frac{\mu u}{|x|^2}=\frac{|u|^{2^{*}(s)-2}u}{|x|^s}+\lambda|u|^{q-2}u,\ \ &;x\in\Omega,\\D_\gamma{u}+\alpha(x)u=0,&;x\in\partial\Omega\backslash\{0\},\end{array}\right.$其中$\Omega $ 是 $ R^N$ 中具有 $ C^1$边界的有界区域, $ 0\in\partial\Omega$, $N\ge5$. $2^{*}(s)=\frac{2(N-s)}{N-2}$ (该文研究了如下的奇异椭圆方程Neumann问题$\left\{\begin{array}{ll}\disp -\Delta u-\frac{\mu u}{|x|^2}=\frac{|u|^{2^{*}(s)-2}u}{|x|^s}+\lambda|u|^{q-2}u,\ \ &;x\in\Omega,\\D_\gamma{u}+\alpha(x)u=0,&;x\in\partial\Omega\backslash\{0\},\end{array}\right.$其中$\Omega $ 是 $ R^N$ 中具有 $ C^1$边界的有界区域, $ 0\in\partial\Omega$, $N\ge5$. $2^{*}(s)=\frac{2(N-s)}{N-2}$ (该文研究了如下的奇异椭圆方程Neumann问题其中Ω是RN中具有C1边界的有界区域,0∈■Ω,N≥5.2*(s)=2(N-s)/N-2(0≤s≤2)是临界Sobolev-Hardy指标, 1
0.利用变分方法和对偶喷泉定理,证明了这个方程无穷多解的存在性. 相似文献
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介绍了砷化镓材料和器件中高频电场的分布测量的新方法——谐波混频脉冲电光检测:它的原理、实验装置以及在砷化镓共平面波导中微波驻波场分布测量中应用的结果.在频率高达20.10GHz及开路、短路和50Ω不同的负载条件下测得的结果与理论预计值符合很好.本文最后对方法的灵敏度和空间分辨率进行讨论. 相似文献
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计算模拟了在ps脉冲抽运周期结构GaAs晶体差频产生窄带THz波过程中,对于不同波长、不同脉宽的抽运光,周期结构GaAs晶体的走离长度和最佳周期长度的变化,并对计算结果进行了理论分析.研究了周期结构GaAs晶体的畴数对THz波光谱的影响.根据GaAs晶体温度色散公式,计算并分析了晶体最佳周期长度的温度调谐特性,研究了温度变化对THz波光谱的影响,提出了通过温度调谐实现在周期结构GaAs晶体中产生宽调谐、窄带宽THz波的新方法,该计算结果为下一步的实验研究提供了理论基础.
关键词:
ps脉冲
差频产生窄带THz波
周期结构GaAs晶体
温度调谐 相似文献
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Titanium dioxide (TiO2) films were fabricated by cosputtering titanium (Ti) target and SiO2 or Si slice with ion-beam-sputtering deposition (IBSD) technique and were postannealed at 450 °C for 6 h. The variations of oxygen bonding, which included high-binding-energy oxygen (HBO), bridging oxygen (BO), low-binding-energy oxygen (LBO), and three chemical states of titanium (Ti4+, Ti3+ and Ti2+) were analyzed by X-ray photoelectron spectroscopy (XPS). The enhancement of HBO and reduction of BO in O 1s spectra as functions of SiO2 or Si amount in cosputtered film imply the formation of Si-O-Ti linkage. Corresponding increase of Ti3+ in Ti 2p spectra further confirmed the property modification of the cosputtered film resulting from the variation of the chemical bonding. An observed correlation between the chemical structure and optical properties, refractive index and extinction coefficient, of the SiO2 or Si cosputtered films demonstrated that the change of chemical bonding in the film results in the modification of optical properties. Furthermore, it was found that the optical properties of the cosputtered films were strongly depended on the cosputtering targets. In case of the Si cosputtered films both the refractive indices and extinction coefficients were reduced after postannealing, however, the opposite trend was observed in SiO2 cosputtered films. 相似文献
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R.T.A. Khan 《Solid State Communications》2006,137(3):110-114
Static computer simulation techniques have been employed for structural investigation of the La1−xSrxVO3 series. Potential parameters for V3+-O2− and V4+-O2− have been derived which reproduces the crystal structures of end members with sufficient accuracy. Variations of lattice parameters and bond distances with Sr concentration have been studied. The calculated lattice parameters decrease with increase in the Sr concentration. A structural phase transition from orthorhombic to cubic is observed at 50% Sr doping level. 相似文献