太赫兹( THz)波具有很高的研究价值和广阔的应用前景，实现 THz技术广泛应用的关键之一是研制高功率、高能量、高效率、室温运行、可调谐、低成本和便携式的 THz光源。光泵气体THz激光器具有功率高，能量大，波长范围广，技术可靠等优点，在透视成像和无损检测等领域成为可靠的 THz源。本文对利用横向激励高气压( TEA) CO2激光器 9P(20)支线泵浦 CH3F气体产生的 496 μm THz波进行实验研究，并对影响 THz波能量输出的主要因素进行分析讨论。实验中获得的最大THz波脉冲能量为 57.14 μJ，输出波长为 490 μm。

THz wave has high research value and broad application prospects in many fields. One of the keys for wide applications of THz technology is to develop THz sources with high power, high energy, high efficiency, room temperature operation, tunability, low cost, and portability. An optically pumped gas THz laser has the advantages such as high power, high energy, wide wavelength range, and reliability, which make it be a reliable THz source in the fields of perspective imaging and nondestructive testing. In this paper, the 496 μm THz wave is investigated, which is generated by using the 9P(20) branch line of a Transversely Excited Atmospheric(TEA) CO2 laser when pumping the CH3F gas. In addition, the influences of some factors on the output power of THz are also analyzed. The maximum THz pulse energy obtained in the experiment is 57.14 μJ, and the wavelength is 490 μm.