【机 构】
：
KeyLaboratoryofAdvancedMicro-StructuredMaterialsMOE,InstituteofPrecisionOpticalEngineering,SchoolofP
论文部分内容阅读
A Schwarzschild microscope with a numerical aperture of 0.2 and a magnification of 130 in a 100 μm field of view (FOV) is designed and is working at 13.5 nm. Meanwhile, a CCD is used as a detector with a pixel size of 13 μm×13 μm and imaging area of 13 mm×13 mm. The imaging quality with tolerances of system and errors of mirrors are considered. We obtain that the best on-axes object resolution can be up to about 200 nm, the average value is 230 nm, and the resolution is about 360 nm at 80 μm FOV.
其他文献
基于可视化观察,研究了光纤激光-TIG电弧复合焊接等离子体的多重形貌特征。结果表明:基于等离子体光强的非均匀分布特性,利用多重成像法可同时观测出复合焊接等离子体的三重像和四重像,并可区分出金属等离子体和电弧等离子体,而且采用氦气保护比采用氩气保护更易于区分;在相同的电弧电流和成像条件下,复合焊接等离子体的面积明显大于单电弧焊接等离子体的面积;TIG电弧-激光复合焊接等离子体的面积明显大于激光-TIG电弧复合焊接等离子体的面积;复合焊接等离子体中金属等离子体与保护气并未充分混合,金属等离子体对复合焊接等离子
对激光烧结制备钛酸铋Bi4Ti3O12陶瓷进行了研究。采用CO2激光直接辐照Bi4Ti3O12陶瓷素坯表面, 激光功率密度为20～30 W/cm2, 烧结温度为1000 ℃左右。与传统固相反应烧结技术制备的Bi4Ti3O12陶瓷相比, 激光烧结制备的Bi4Ti3O12陶瓷致密度较高, 相对密度能达到95%, 压电性能提高了约60%, 铁电性能的增强表现在矫顽场的明显减小和易于极化。通过X射线衍射、扫描电镜分析了激光烧结Bi4Ti3O12陶瓷的物相、显微结构和电性能改变的机理。实验现象和结果表明, 激光烧结
Here, we used the micro P-scan method to investigate the saturated absorption (SA) of different layered
随着高精度光钟及其各种应用的发展,人们对时频传输技术的精度要求越来越高。基于光纤的时频传输技术已经较为成熟,而自由空间激光时频传输技术可以应用在不方便铺设光纤、快速机动场合以及星地、星间时频传输领域。介绍了国内外在近地空间以及星地间进行时频传输的研究现状,并对其未来的发展趋势进行了展望。未来自由空间激光时频传输将会朝更高的传输精度、时频传输、测距、通信一体化以及时频空间组网的方向发展。
自1960年研制成激光器以来，工程师们，研究人员也一样，都想把激光通讯用于空间传播及光波导通路。本文涉及利用光学纤维的激光束和通讯系统。
The dependencies of stimulated Brillouin scattering (SBS) threshold in pulsed fiber amplifiers on spectral linewidth, pulse duration, and repetition rate are measured and discussed. Experimental results show that the SBS threshold is highly related to spe
An all-optical transient waveform equivalent time sampling system based on cross-gain modulation (XGM) in semiconductor optical amplifier (SOA) is presented. A noisy SOA dynamic model and PIN equivalent circuit function are employed for system evaluating.
Bose–Einstein condensate (BEC) exhibits a variety of fascinating and unexpected macroscopic phenomena, and has attracted sustained attention in recent years—particularly in the field of solitons and associated nonlinear phenomena. Meanwhile, optical latti