A coherent frequency-domain THz spectrometer with a signal-to-noise ratio of 60 dB at 1 THz
A coherent frequency-domain THz spectrometer with a signal-to-noise ratio of 60 dB at 1 THz
复制标题
1 THz 时信噪比为 60 dB 的相干频域太赫兹光谱仪
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
E. Brown
中科院分区：
文献类型：
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作者：
J. R. Demers;R. Logan;N. J. Bergeron;E. Brown
太赫兹频域光谱仪使用两个时代来实现：高度紧凑的结构中的砷化镓光电混合器，利用全固态元件和无运动部件。数字信号处理电子产品提供精确的频率控制，并产生~200 MHz的THz信号频率精度。在200 GHz~1.85 THz范围内，连续扫频分辨率优于1 GHz。实验结果表明，相干检测灵敏度与理论计算结果吻合较好，在200 GHz和1 THz时的信噪比分别为80db*Hz和60db*hz，在空气中的路径长度为1英尺。
A terahertz frequency domain spectrometer is implemented using two ErAs:GaAs photomixers in a highly compact configuration, utilizing all solid-state components and no moving parts. Digital signal processing electronics provide precise frequency control and yield ~200 MHz accuracy of the THz signal frequency. Continuous frequency sweeping is demonstrated with better than 1 GHz resolution from 200 GHz to 1.85 THz. The coherent detection sensitivity is shown to be in good agreement with previous theoretical predictions and yields a signal-to-noise ratio of 80 dB*Hz at 200 GHz and 60 dB*Hz at 1 THz through a path length in air of one foot.