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首页> 美国卫生研究院文献>Scientific Reports >Measurement of absolute frequency of continuous-wave terahertz radiation in real time using a free-running dual-wavelength mode-locked erbium-doped fibre laser
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Measurement of absolute frequency of continuous-wave terahertz radiation in real time using a free-running dual-wavelength mode-locked erbium-doped fibre laser

机译：使用自由运行双波长锁模掺-光纤激光器实时测量连续波太赫兹辐射的绝对频率

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A single, free-running, dual-wavelength mode-locked, erbium-doped fibre laser was exploited to measure the absolute frequency of continuous-wave terahertz (CW-THz) radiation in real time using dual THz combs of photo-carriers (dual PC-THz combs). Two independent mode-locked laser beams with different wavelengths and different repetition frequencies were generated from this laser and were used to generate dual PC-THz combs having different frequency spacings in photoconductive antennae. Based on the dual PC-THz combs, the absolute frequency of CW-THz radiation was determined with a relative precision of 1.2 × 10−9 and a relative accuracy of 1.4 × 10−9 at a sampling rate of 100 Hz. Real-time determination of the absolute frequency of CW-THz radiation varying over a few tens of GHz was also demonstrated. Use of a single dual-wavelength mode-locked fibre laser, in place of dual mode-locked lasers, greatly reduced the size, complexity, and cost of the measurement system while maintaining the real-time capability and high measurement precision.
机译：利用一个自由运行的双波长锁模掺-光纤激光器，使用光载波的两个THz梳（双）实时测量连续波太赫兹（CW-THz）辐射的绝对频率PC-THz梳）。从该激光器产生具有不同波长和不同重复频率的两个独立的锁模激光束，并用于在光电导天线中产生具有不同频率间隔的双PC-THz梳。基于双PC-THz梳，确定CW-THz辐射的绝对频率，相对精度为1.2×10 −9 ，相对精度为1.4×10 −9 < / sup>，采样率为100 ofHz。还演示了实时确定CW-THz辐射绝对频率在几十GHz范围内变化的方法。使用单双波长锁模光纤激光器代替双锁模激光器，可以在保持实时性和高测量精度的同时，大大降低测量系统的尺寸，复杂度和成本。

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