用特殊眼模型研究人眼像差与色差对视觉的影响

在光轴和视轴不重合的眼球模型中,设计了一种仅消轴向色差(LCA)而保持横向色差(TCA)不变的元件,建立了仅有TCA的眼模型。进而将实测的人眼高阶像差数据沿视轴方向引入眼模型,用以研究色差和高阶像差的相互作用。建立了三款个性化眼球模型,研究了明视觉状态下高阶像差、色差(LCA+TCA)、LCA和TCA对视觉的影响以及它们之间的相互作用。结果表明:对于多数人眼,色差对视觉的影响远大于高阶像差的影响,并且色差的存在进一步抑制了高阶像差的影响。在色差对视觉的影响中,LCA是具有统治地位的因素;对于多数人眼,TCA的影响可以忽略。     

增益导引-折射率反导引大模场光纤激光器抽运技术研究进展

介绍了一种新型增益导引-折射率反导引大模场光纤的结构、基本理论以及其在光纤激光器领域的重要应用. 在综合分析了不同抽运条件下的激光输出特性以及光纤的热效应特征后, 得出侧面抽运是增益导引-折射率反导引大模场光纤的最佳抽运方案的结论; 重点介绍了增益导引-折射率反导引大模场光纤侧面抽运的理论模拟以及基于V形槽技术的侧面抽运实验研究过程, 为相关领域的实验研究提供了参考; 最后分析了实验结果与理论差距较大的原因, 并提出了改进的方向.     

Ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber

An ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber(GDC-PCF)that can work in a wavelength range from 1120 nm to 1730 nm is proposed in this paper. Through optimizing fiber configuration, the polarization splitter has an extinction ratio of-56.3 dB at 1.55 μm with a fiber length of 4.8 mm.Compared with the photonic crystal fiber reported splitters, to our knowledge, the GDC-PCF splitter with the extinction ratio below-20 dB has a super wide bandwidth of 610 nm. Due to the excellent splitting characteristics, the GDC-PCF will be used in coherent optical communication systems in a wavelength range from infrared to mid-infraed.     

极坐标激光直写系统原点定位的实验研究

分析了旋转线性光栅法对准光轴与旋转机械轴中心的理论准确度,实验研究了极坐标激光直写系统的原点定位.在极坐标激光直写系统下进行了圆环线条写入实验,得出了原点定位的准确度,原点定位准确度优于0.5 μm,实验与理论定位准确度基本一致.     

偏心和倾斜光学系统的像差特性

运用一种新的分析偏心和倾斜光学系统初级像差特性的方法—矢量像差理论,分析了具有较大交叉倾斜角的平行平板光学系统和具有较大倾斜角的光楔光学系统的像差特性.通过ZEMAX光学设计软件像差分析功能中的垂轴像差曲线、场曲曲线和点列图加以比较,两者非常吻合,证明该理论可以对具有较大倾斜元件的非共轴光学系统设计起指导作用.     

基于双包层光纤布拉格光栅传感器的锂电池组温度场监控

锂离子电池是当今最通用的储能技术之一,锂电池的可靠性和安全性一直是业界追求的目标,因此准确监控电池安全状态显得尤为重要.锂电池内部的热失控是一切锂电池安全问题的根源,为克服目前锂电池组温度测量系统测温精度不高,较高温度下长时间工作稳定性不足等问题,本文提出了一种基于双包层光纤布拉格光栅(FBG)的准分布式锂电池组温度监测系统.通过搭建4通道16个双包层FBG点位对18650锂电池组进行温度场及鼓包形变监测,结果表明在0—450℃的温度条件下可以精确确定由短路等问题产生异常温度升高的点位,相应温度灵敏度为10 pm/℃,分辨率达0.1℃,并且贴于锂电池壳体表面的双包层FBG还可以监测电池壳体表面出现的鼓包形变现象,其纵向压力应变灵敏度达142 pm/N.本文的双包层FBG准分布式锂电池组温度场监测系统既可以保证高精度的温度、形变测量,同时具有良好的稳定性和抗干扰能力,表明本文的研究工作有望为锂电池组的安全监测和使用提供可靠的理论与实验依据.     

Correlation between Post-LASIK Starburst Symptom and Ocular Wavefront Aberrations

Monochromatic aberrations in post laser in-situ keratomileusis （LASIK） eyes are measured. The data are categorized into reference group and starburst group according to the visual symptoms. Statistic analysis has been made to find the correlation between the ocular wavefront aberrations and the starburst symptom. The rms aberrations of the 3rd and 4th orders for the starburst group are significantly larger than those for the reference group. The starburst symptom shows a strong correlation with vertical coma, total coma, spherical aberrations. For 3-mm pupil size and 5.8-mm pupil size, the modulation transfer function （MTF） of the starburst group are lower than those of the reference group, but their visual acuities are close. MTF and PSF analyses are made for two groups, and the results are consistent with the statistical analysis, which means the difference between the two groups is mainly due to the third- and fourth-order Zernike aberrations.     

Measurements of AIM for Visible Wavelength Based on Individual Eye Model

We measure and calculate the aerial image modulation （AIM） of human retina for visible wavelengths based on the individual eye model. By employing the optical design software ZEMAX, we obtain the modulation transfer function （MTF） of human eye in visible wavelengths. Using CSV-1000 and VAF-1000, the contrast sensitivity function （CSF） and the visual acuity （VA） for the same eye are measured. Then the AIM of human retina could be acquired by the relations between MTF and CSF and between MTF and VA. The AIM of human retina is independent of MTF, and the values of AIM for normal eyes （without retina disease） are similar, so the assembly average for large numbers of normal eyes can be a standard AIM curve, which is helpful for the diagnosis of diseases in the retina system.     

Zn(BTZ)2白色有机电致发光材料的合成及其器件制备

以PCl₃为脱水剂,将邻氨基硫酚与水杨酸脱水环化合成出2-(2-羟基苯基)苯并噻唑,并进一步将所得产物与乙酸锌反应合成出2-(2-羟基苯基)苯并噻唑螯合锌(Zn(BTZ)₂)材料。以该配合物作为发光层制备出结构为ITO/PVK:TPD/Zn(BTZ)₂/Al近白色电致发光器件,其色坐标位于白场之内(x=0.242,y=0.359),在驱动电压为16V时,亮度达3200cdm²,对应的量子效率为0.32%。进一步在Zn(BTZ)₂中掺入橙红色染料Rubrene,制成ITO/PVK:TPD/Zn(BTZ)₂:Rubrene/Al结构器件,实现了纯白色发光(色坐标值:x=0.324,y=0.343),非常接近于白色等能点,且量子效率达0.47%。最后对上述器件的发光和电学性能进行了深入的研究和探讨。     

厚非线性介质瞬态热光非线性效应的研究

瞬态热光非线性效应是指由脉冲宽度可以和非线性效应的建立时间相比拟的纳秒脉冲激光入射产生的热光非线性效应.用Zscan法测量了不同厚度、不同束腰半径碘的酒精溶液的瞬态热光非线性效应曲线.从声波的传播方程和光波的非线性传播方程出发,用数值计算方法模拟了这一非线性过程.并对实验结果和数值模拟结果进行了比较 关键词： 瞬态热光非线性效应 非线性光学 数值计算