光纤激光器 半导体激光器 激光切割
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简介

光谱学是一种物理/化学分析方法,其起源可以追溯到艾萨克.牛顿(Isaac Newton)爵士。它利用电磁辐射的吸收 或发射来表征原子和分子的电子和结构性质。传统的光谱学描绘出的是被测样品的电子和/或动力学状态的在一 段时间上平均后的特征。这是因为分子电子和振动过程的动力学发生在极短的时间尺度上(通常在时域上从皮 秒/ps到飞秒/fs)。传统的光谱方法具有相对较差的时间分辨率(0.0001-1秒),并且这产生的是原子/分子/电子集 合在观察的时间尺度上平均的数据。图1显示了一些有代表性的分子过程的时间尺度。


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简介

In this paper, we present a simple method to analyze the injection efficiency of the photodiode interface circuit under fast shuttering conditions for active Imaging applications. This simple model has been inspired from the companion model for reactive elements largely used in CAD. In this paper, we demonstrate that traditional CTIA photodiode interface is not adequate for active imaging where fast and precise shuttering operation is necessary. Afterwards we present a direct amplification based photodiode interface which can provide an accurate and fast shuttering operation on photodiode. These considerations have been used in NIT’s newly developed ROIC and corresponding SWIR sensors both in VGA 15um pitch (NSC1201) and also in QVGA 25um pitch (NSC1401).

 
 
 
 
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