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光电工程2012年第39卷第8期 目录
【出 处】
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光电工程
【发表日期】
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2012年39期
其他文献
In this Letter, a single-frequency fiber laser using a molybdenum disulfide (MoS
Analysis of colonic autofluorescence spectra using multivariate curve resolution alternating least s
Autofluorescence (AF) spectra of colonic normal and adenocarcinoma tissues are measured under excitation of 337 nm and analyzed by multivariate curve resolution alternating least squares (MCR-ALS) method using non-negativity constraint. Collagen, nicotina
Jiuzhang 2.0 represents significant improvements, beyond the last year’s landmark.
期刊
变焦光学系统在连续变焦过程中, 由于变焦曲线的计算和加工精度, 导致实际像面离焦, 成像质量下降。变焦系统的特点是长焦距对应窄视场, 短焦距对应宽视场。将波前编码技术应用于变焦系统, 在系统的光瞳面设置相位掩模,则扩展了原系统的焦深和景深, 使调制传递函数对离焦不敏感, 同时提高短焦距宽视场的边缘成像质量。文章对原系统和应用波前编码技术的新系统的成像特性进行了分析和对比,随后讨论了掩模板的相位因子对系统的景深、焦深延拓以及对像质的稳定作用。仿真显示: 变焦波前编码光学系统对离焦不敏感, 可以很好地扩大系统
We have developed a two-photon fluorescence microscope capable of imaging up to 4mm in turbid media with micron resolution. The key feature of this instrument is the innovative detector, capable of collecting emission photons from a wider surface area of
报道了基于空芯光纤中气体受激拉曼散射效应的1.5 μm波段光纤激光实验。利用高峰值功率、窄线宽、亚纳秒量级的1064 nm微芯激光抽运一段充高压乙烷气体的空芯光纤。通过乙烷气体分子的受激拉曼散射，获得了1553 nm的激光输出，峰值功率达到16.6 kW，线宽小于0.2 nm，脉宽约为435 ps。该功率水平是目前在掺铒光纤中获得的最高峰值功率的4倍以上。该研究为同时实现高峰值功率和窄线宽的1.5 μm波段光纤激光提供了一条新的技术途径。
Dark-current-voltage curves and photon-current-voltage curves were measured by a passive quenched circuit so that the voltage applied to the avalanche photodiode can be much higher than breakdown voltage in study on the depth of punch through. The photo-c