【摘 要】
：
A new miniature spectrometer with two entrance slits is proposed to expand the spectral band. The proposed spectrometer is designed such that the two entrance slits share the same concave grating and detector array. The two slits are located at different
【机 构】
：
DivisionofAdvancedManufacturing,GraduateSchoolatShenzhen,TsinghuaUniversity,Shenzhen518055,China
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
A new miniature spectrometer with two entrance slits is proposed to expand the spectral band. The proposed spectrometer is designed such that the two entrance slits share the same concave grating and detector array. The two slits are located at different positions such that the spectral range of the same light source incident on the detector array varies greatly between the two slits. Only one of the two slits is illuminated at a given time; as such, the two spectral ranges are sequentially measured. Theoretical calculation and experimentation are conducted to verify the proposed design.
其他文献
用越来越短的时间分辨率来测量物理现象的变化情况是当代研究和发展的一个主要部分。实际上，在激光聚变、时间分辨光谱学和激光研究这样的领域,了解瞬态过程(所谓短脉冲）和稳态过程对于未来的发展是至关重要的。
针对电子侦察中PSK信号的载频估计问题，提出一种低信噪比下载频估计新方法。该方法将PSK信号划分为等长度的交叠区间，提取各个区间内信号频谱的聚集性测度作为特征参数，然后将此特征参数导入网格密度聚类算法，以聚类结果作为载频估计特征类，最后将特征类对应的频谱叠加后提取峰值得出信号载频估计值。该方法避免了传统PSK信号载频估计的非线性运算，显著降低了PSK信号载频估计的信噪比门限，且无需先验知识，适合于电子侦察场合。仿真实验结果证实了该方法在低信噪比下PSK信号载频估计的有效性。
针对所研制的光栅楔形平板干涉动态角度測量系统，提出了一种确定动态测量零点的新方法。利用干渉法找到360°自然角度基准中光程差达到最大和最小的特殊点,作为动态测量时的固定零点。采用这种标定方法不需要另外增加光路,结构简单，操作方便。实验表明，定位精度优于0.5"。
通过对薛定谔方程的数值解,给出了扫频脉冲光场对四能级原子系统作用的结果,说明了扫频脉冲光场应用于高斯分布的多普勒加宽原子统计系统,在适当的扫频条件和激光功率下能得到比单色或调幅脉冲光场更有效的三步光电离。
Patterning of self-assembled monolayer (SAM) was demonstrated by area-selective deposition of SAMs on a pattern made by synchrotron radiation (SR) stimulated etching SiO2 thin films. The etching was conducted by exposing the SiO2 films to SR through a Co
Cathode samples of nano-diamond by graphitization pretreatment with different temperatures were fabricated by electrophoresis, then the structures and morphologies of the cathode samples were characterized by scanning electron microscope (SEM) and X-ray d
放电引发重频HF/DF激光器具有的波长和功率优势使其成为当前中红外激光技术研究的热点之一。介绍了在利用紫外预电离横向放电结构建立的放电引发重频HF激光装置上，通过对气体循环系统增益区流场结构分析和注入管道结构的优化设计开展的重频能量稳定输出实验研究。实验结果表明，通过管道结构的优化设计，放电增益区流场均匀性得到明显改善，气体置换的最低流速达到6.5 m/s，激光器稳定运行频率由60 Hz提高到100 Hz，且稳定体放电的单位体积放电沉积能量由1.6 J/(ml?atm)(1 atm=1.013×105 P
泵浦光能的泵浦灯效率低、仅吸收百分之几的灯的放射能，此乃是固体激光器的缺点，虽作种种改良，但未曾收效。最近美帝电-光系统公司发现一种新方法，在汞灯中掺入碘化物，在实验室成功地使掺钕钇铝石榴石激光器同二氧化碳激光器一样，吸收30%~50%灯的放射能，将其转换成相干光射出，从而大大提高固体激光器的效率。泵浦光能的泵浦灯效率低、仅吸收百分之几的灯的放射能，此乃是固体激光器的缺点，虽作种种改良，但未曾收效。最近美帝电-光系统公司发现一种新方法，在汞灯中掺入碘化物，在实验室成功地使掺钕钇铝石榴石激光器同二氧化碳激光
We report on a two-arm hybrid high-power laser system (HPLS) able to deliver 2 × 10 PW femtosecond pulses, developed at the Bucharest-Magurele Extreme Light Infrastructure Nuclear Physics (ELI-NP) Facility. A hybrid front-end (FE) based on a Ti:sapphire c
针对真实场景中因行人相互遮挡难以被精确检测的情况,提出一种基于注意力机制的特征提取增强检测算法。首先,通过添加注意力模块学习特征通道间关系和特征图空间信息,增强对行人目标可视区域的特征提取。其次根据行人数据的实际尺寸,采用k-means++算法对行人标注进行聚类,确定锚框(anchor)大小及比例。利用距离交并比损失函数(DIOULoss)设计检测器的损失函数,使得检测框的回归更关注候选框与真实框