Simultaneous measurement of the 1st and 2nd harmonics of a phase modulated coherent frequency-domain THz spectrometer
Simultaneous measurement of the 1st and 2nd harmonics of a phase modulated coherent frequency-domain THz spectrometer
复制标题
同时测量相位调制相干频域太赫兹光谱仪的一次和二次谐波
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
D. Daughton
中科院分区：
文献类型：
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作者：
J. R. Demers;B. Kasper;D. Daughton
我们报告了一个频域太赫兹光谱仪集成，光纤耦合，定制制造的锂酸盐光学相位调制器。我们讨论了采用光学相位调制代替偏置调制来同时测量相位调制太赫兹辐射的一次和二次谐波。该技术允许去除光混合干涉图案，并且当顺序记录0°和90°数据时，不会遭受与我们先前的技术相同的问题。该系统还具有共模相位漂移抑制的优点。
We report on a frequency domain terahertz spectrometer with an integrated, fiber-coupled, custom manufactured lithium-niobate optical phase-modulator. We discuss employing optical phase modulation instead of bias modulation for simultaneously measuring the 1st and 2nd harmonics of the phase modulated THz radiation. This technique allows the removal of the photomixing interference pattern and does not suffer from the same issues as our previous technique when the 0° and 90° data was recorded sequentially. The system also enjoys the benefits of common mode phase drift rejection.