摘要：In this paper a fast digital real-time spectrometer was developed for timing and analysis of nuclear pulse *** hardware system design and algorithm implementation with field-programming gate array(FPGA) and digital signal processor(DSP) were *** performance of the digital constant fraction discrimination(dCFD) platform was experimentally tested with Agilent 80 MHz function/arbitrary waveform generator and LaCl 3:Ce 3+ scintillator detector for 22 Na positron annihilation gamma *** amplitude and time information of photon was online *** energy resolution could be 5.525% and the timing resolution 293.75 ps,the system error estimation of dCFD approach was also *** results showed that this spectrometer achieved a timing resolution close to that of traditional CFD timing resolution with a more simplified system structure.

摘要：A compact C-band high brightness photoinjector for ultra-fast electron diffraction(UED)is under development at Tsinghua *** C-band photoinjector,operating at 5.172 GHz,uses a 1.45-cell C-band RF gun as the electron *** design of the RF gun has addressed the physics,beam dynamics and mechanical aspects,and based on these design studies,a prototype has been *** order to obtain optimized performance for the UED,beam dynamics simulation has been carried out using the particle tracking code Astra for the photoinjector consisting of an alternative multi-cell RF gun design and a C-band compressor *** beam dynamics parameters that are optimized include the bunch length,peak current,horizontal emittance,and position of the minimum bunch length.

摘要：PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay *** central vessel was designed to accommodate a staged target volume increase from initially 120 kg(stage I)to 0.5 t(stage II)and eventually to a multi-ton *** experiment is located in the Jinping Deep-Underground Laboratory in Sichuan,*** detector operates in dual-phase mode,allowing detection of both prompt scintillation,and ionization charge through proportional *** this paper a detailed description of the stage I detector design and performance as well as results established during the commissioning phase are presented.

摘要：Ni/Ti multilayers, which can be used for neutron monochromators, are designed, fabricated and measured. Firstly, their reflectivities are simulated based on the Nevot-Croce model. Reflectivities of two Ni/Ti multilayer mirrors with periods d = 10.3 nm （M1） and d = 7.8 nm （M2） are calculated. In the calculation, the reflectivity of the Ni/Ti multilayer is taken as a function of the gazing angle with different roughness factors δ =1.0 nm and = 1.5 nm. Secondly, these two multilayers are fabricated by the direct current magnetron sputtering technology. Thirdly their structures are characterized by small-angle x-ray diffraction. The roughness factors are fitted to be 0.68 nm and 1.16nm for M1 and M2, respectively. Finally their reflective performances are measured on the V14 neutron beam line at the Berlin Neutron Scattering Centre （BENSC）, Germany. The experimental data show that the grazing angle of the reflected neutron intensity peak increases, but the reflected neutron intensity decreases, with the decreasing periods of the multilayers.

摘要：In this review paper, we introduce a self-phase controlled stimulated Brillouin scattering phase conjugate mirror(SCSBS-PCM) and the Kumgang laser. The SC-SBS-PCM was proposed and demonstrated its success at the academic low power level, ~100 mJ@10 Hz. The Kumgang laser is under development to verify whether the SC-SBS-PCM is operable at the k W level. It is a 4 kW beam combination laser combining four 1 k W beams using the SC-SBS-PCM. If the Kumgang laser functions successfully, it will be the most important step towards a Dream laser, a hypothetical laser with unlimited power and a high repetition rate.

摘要：在最近的年里， silica-on-silicon 基于光波导是的 multimode 干扰(MMI ) 一个有趣的研究话题。它在硅石上正在被预付各种各样的研究基于的 MMI coupler。这篇论文代表 silica-on-silicon 的最佳的设计的考虑为更好的性能的基于的 MMI 光 coupler。为那，我们在一个特别盒子上说明了模拟结果 4 ????? ┱ ?

摘要：为敏化染料的太阳能电池的没有金属的 indoline 染料被采用量化学方法学习。地面的性质和没有金属的 indoline 的激动的状态的比较学习为染料染 -- 揭示的敏化的太阳能电池：rhodanine 的数字包围增加，人之间的精力差别和 LUMO 减少，在有有约束力的精力的吸收光谱有红移动的(i) 增加了，并且转变偶极子时刻减少了；(ii ) 把微分密度基于充电的分析，我们观察到费用和精力从 phenylethenyl 被转移到 indoline， rhodanine 响；(iii ) 电子洞连贯主要在 indoline 和 rhodanine 戒指上，并且激子尺寸分别地是为有一和二枚 rhodanline 戒指的 indoline 染料的 30 和 40 个原子。这些结果为敏化染料的太阳能电池在没有金属的 indoline 染料用作电脑辅助的设计的一个好例子。

摘要：In this paper,a spatial perturbation scheme is proposed to suppress the spiral wave in the modified Orengonator model,which is used to describe the chemical reaction in the light-sensitive *** controllable external illumination Φ is perturbed with a spatial linear *** our numerical simulation,the scheme is investigated by imposing the external controllable illumination on the space continuously and/or *** numerical simulation results confirm that the stable rotating spiral wave still can be removed with the scheme proposed in this paper even if the controllable Φ changed *** and space *** the scheme is also used to control the spiral wave and turbulence in the modified Fitzhugh-Nagumo *** is found that the scheme is effective to remove the sable rotating and meandering spiral wave but it costs long transient period and intensity of the gradient parameter to eliminate the spiral turbulence.

摘要：Temperature-insensitive phase-matching of second-harmonic generation(SHG)can be realized using two nonlinear crystals with opposite signs of the temperature derivation of phase *** design procedure for optimizing crystal lengths is presented,and full numerical simulations for the SHG process,based on realistic crystals,are performed at a typical high-power-laser wavelength of~1μ*** is suggested that the proposed two-crystal design can support high efficiency(60–70%)of SHG in the high-average power regime of a kilowatt.

摘要：具有高发光性能的二维材料被认为是实现光电器件应用的极具前途的材料.其中,硒化铟(InSe)是一种具有代表性的二维材料,近些年在光电领域表现出巨大的应用潜力,因此吸引了研究者们的广泛关注.然而,InSe的光-物质相互作用极其微弱,因为其带隙激子的偏振取向是面外的,主要被面外偏振光激发而对正常入射光(面内偏振)的响应极其微弱,这大大限制了其在光电器件中的实际应用.在此,我们提出了一种方法,即通过将少层InSe转移到Ag纳米棱镜阵列上,显著提升InSe在线性和非线性体系的光学响应.结合实验分析,增强的机理主要来自于两种机制的协同作用:一方面,局域表面等离子体共振产生的局部强化电磁场垂直分布于金属表面,与面外偏振的InSe带隙激子发生高效耦合,增强了InSe的光-物质相互作用;另一方面,独特设计的弯曲结构增加了入射光在平面外的偏振分量,促使InSe面外激子对光的吸收和散射效率增强.通过进一步调整InSe的厚度,我们实现了光致发光和二次谐波信号的两个数量级的增强.因此,我们的工作为改善InSe的光学特性提供了一个有效的途径,使其在光电器件的实际应用中迈出了重要的一步.