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Frequency-domain spectroscopy using high-power tunable THz-wave sources: towards THz sensing and detector sensitivity calibration

机译：使用大功率可调谐太赫兹波源的频域光谱法：朝着太赫兹感测和检测器灵敏度校准

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摘要

The development of reliable, high-power, frequency-tunable terahertz (THz)-wave sources is crucial for a wide variety of applications, such as spectroscopy, imaging, and sensing. In order to generate frequency-tunable THz waves at room temperature, one of the most promising methods is a wavelength conversion in nonlinear optical crystals. Here, we present our recent results on high-power, widely-tunable, frequency-agile THz-wave sources based on nonlinear parametric processes in MgO:LiNbO_3 crystals. By changing the noncollinear phase-matching condition in MgOiLiNbO_3, the tunability of sub-nanosecond-pumped injection-seeded THz-wave parametric generators (is-TPGs) covers the 3.65-octave frequency range from 0.37 THz up to 4.65 THz. The monochromatic THz-wave output from is-TPGs is greater than 10 kW peak power with the linewidth of approximately 3 GHz and the stability of 1%. These is-TPG systems are reliable and promising high-power tunable THz-wave sources for frequency-domain spectroscopic measurements towards THz sensing and detector sensitivity calibration.
机译：可靠的，高功率的，频率可调的太赫兹（THz）波源的开发对于光谱分析，成像和传感等各种应用至关重要。为了在室温下产生频率可调的太赫兹波，最有前途的方法之一是在非线性光学晶体中进行波长转换。在这里，我们介绍基于MgO：LiNbO_3晶体中非线性参数过程的高功率，可广泛调谐，频率捷变的太赫兹波源的最新研究结果。通过更改MgOiLiNbO_3中的非共线相位匹配条件，亚纳秒级泵浦注入式THz波参量发生器（is-TPG）的可调性覆盖了从0.37 THz到4.65 THz的3.65倍频程。 is-TPG的单色太赫兹波输出大于10 kW峰值功率，线宽约为3 GHz，稳定性为1％。这些is-TPG系统是可靠的且有前途的大功率可调谐THz波源，可用于频域光谱测量，用于THz感应和检测器灵敏度校准。

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