取代基对卟啉三阶光学非线性及弛豫过程的影响

研究了取代基对卟啉三阶光学非线性和激发态弛豫过程的影响，发现在同一取代位置，推电子基团取代使得卟啉三阶光学非线性极化纱数Ｘ值相对影响，而吸电子基团取代使得卟啉Ｘ值相对减少，对同一取代基在不同取代装置，发现推电子基团在邻位取代的Ｘ值大于其在对位取代卟啉的Ｘ值，而吸电子基团在邻位取代的Ｘ值小于其在对位取代卟啉的Ｘ值，另外，还发现推电子基团取代的卟啉弛豫过程比吸电子基团取代的卟啉弛豫过程快７倍。     

GeSi合金1×4Y级联分束器的有限差分束传播法模拟设计

进一步研究二个问题：（１）理论模拟的方法由快速傅里叶束传播法（ＦＦＴ－ＢＰＭ）改为有限差分束传播法（ＦＤ－ＢＰＭ），并比较了两者的优缺点。（２）模拟设计了对象提高为由ＧｅＳｉ合金单模脊形光波导组成的Ｙ级联１×４光分束器。结果表明，有限差分束传播法比快速傅里叶束传播法及显形有限差分束传播法（ＥＦＤ－ＢＰＭ），除了数学比较容易外，计算速度也快一些。尤其是对传播步长Δｚ的敏感性，有限差分束传播法远没有快速傅里叶束传播法那样严重，便利了束传播法方法的采用。正如束传播法成功地应用于ＧｅＳｉ合金光波导及Ｙ分支器的理论设计，现在用了１×４Ｙ级联分束器同样得到预想的结果。光束在分束器中传播逐步分成二束再分为四束。符合设计要求。     

酞菁锡（SnPc）多晶薄膜的光电压特性研究

报道了Ａｌ／α－ＳｎＰｃ／ＩＴＯ夹心结构的瞬态光电压随入射光强度和波长变化的演变特性和稳态连续光照射下的光电压作用光谱。稳态光电压作用光谱和其对应吸收光谱的变化趋势非常接近；而瞬态光电压的大小、极性和响应时间则共同取决于入射光的强度和波长。其中瞬态光电压的正峰部分（相对于ＩＴＯ电极）只在较强的光照射下才出现，而且其响应时间也总是慢于同一条件下出现的负电压峰。文中对该现象的内在机制作了初步的探讨。     

高温对富勒碳的影响

 对富勒碳的高温性质进行了研究。实验发现在高于870 K时，富勒碳分子结构被破坏，变成了碳原子的无定形态。讨论了富勒碳所处空间性质对其热性质的影响，认为富勒碳分子的碰撞产生的极化是富勒碳分子结构破坏的主要原因。     

长焦距光学系统杂光系数测试仪

报告了一种新的长焦距光学系统杂光系数测量装置,该装置除具有避免了制作大直径积分球的优点外,还能精确测量轴外杂光系数,分析各部分杂光源对杂光系数的影响.     

金属线膨胀系数测定实验的改进及进一步研究

为了更好地研究金属线膨胀系数在一定温度区间的变化情况,并进一步研究在加热过程中,待测金属热应力、热应变的变化规律,本文在传统的蒸汽喷射加热仪的基础上,组合运用了粘滞系数实验、表面张力实验以及温度传感器实验中的部分实验仪器,测量并计算了相关的物理量,得到了相关性较理想的拟合直线,并通过对比实验进一步论述了该方法的可行性。     

Design of all-optical temporal differentiator using a Moir fiber grating

We design and demonstrate an all-optical temporal differentiator based on a simple Moir fiber grating operated in reflection. The simulation results prove that a single Moir fiber grating with only one π-phase shifted point can act as the first-order temporal differentiator and that a Moir fiber grating incorporating two symmetrical π-phase shifted points can act as the second-order temporal differentiator. A practical Moir fiber grating is fabricated, thereby proving that such a grating can act as the first-order temporal differentiator. Our results verify the feasibility, flexibility, and accuracy of the proposed method.     

Inference of Kinetic Ising Model on Sparse Graphs

Based on dynamical cavity method, we propose an approach to the inference of kinetic Ising model, which asks to reconstruct couplings and external fields from given time-dependent output of original system. Our approach gives an exact result on tree graphs and a good approximation on sparse graphs, it can be seen as an extension of Belief Propagation inference of static Ising model to kinetic Ising model. While existing mean field methods to the kinetic Ising inference e.g., naïve mean-field, TAP equation and simply mean-field, use approximations which calculate magnetizations and correlations at time t from statistics of data at time t?1, dynamical cavity method can use statistics of data at times earlier than t?1 to capture more correlations at different time steps. Extensive numerical experiments show that our inference method is superior to existing mean-field approaches on diluted networks.     

Polarization-modulated analog photonic link with compensation of the dispersion-induced power fading

A novel integrable modulator consisting of a polarization modulator and a polarizer is proposed for constructing a high-performance analog photonic link. By adjusting a polarization controller placed before the modulator, both amplitude modulation and phase modulation with adjustable ratio between them are implemented. This feature is used to shift the peak of the frequency response of a dispersive link to any desired frequency, so the dispersion-induced power fading around the frequency is compensated. A proof-of-concept experiment is performed. The compensation of the dispersion-induced power fading in the proposed analog photonic link increases the spur-free dynamic range as large as 12.5 dB.     

Phase sensitive amplifier for PSK signals based on non-degenerate four-wave-mixing in the optical fiber

A phase-sensitive-amplifier (PSA) using only one pump channel based on frequency non-degenerate four-wave-mixing (FWM) process for phase-shift-keying (PSK) signals is proposed and demonstrated. Theoretical analyses are given first. By optimizing power levels of three channels and parameters of the highly nonlinear fiber (HNLF), the PSA is able to restore the signal fidelity (down to a BER of 10^? 9) as the input signal shows an error-floor with the BER of 10^? 6. Moreover, the PSA for the multi-level PSK signals could be achieved by adjusting the phase relationship between two input signals.