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介绍了运行在1.54THz(195μm)和1.58THz(190μm)的波导型辉光放电激励的大功率连续波DCN激光器的开发和研制工作。该激光器的谐振腔长3.4m,放电长度3m,谐振腔由耐热玻璃制成,直径54mm。谐振腔一端为平面反射镜,一端为金属栅网。工作气体为N2,CD4和He(或D2)的混合气体,在1.54THz的连续激光输出功率大于0.2W。实验中对放电电流、激光管温度、气压等参数进行了优化,研究了EH11模DCN激光在自由空间的传输特性。研究表明,利用新的N2,CD4和D2混合气体的太赫兹DCN激光器可以得到稳定连续的高功率放电。光束传输远场满足高斯分布(z>4m),对各种参数进行优化后,190μm和195μm窗口处输出EH11模功率分别为0.15W和0.16W,可以满足超导托卡马克连续运行的干涉测量的需要。
The development and development of high power continuous wave DCN laser operating at 1.54THz (195μm) and 1.58THz (190μm) waveguide type glow discharge excitation are introduced. The laser resonator length 3.4m, discharge length 3m, resonant cavity made of heat-resistant glass, diameter 54mm. One end of the resonator for the plane mirror, one end of the metal grid. The working gas is N2, a mixed gas of CD4 and He (or D2), and the continuous laser output power at 1.54 THz is greater than 0.2W. In the experiment, discharge current, laser tube temperature, pressure and other parameters were optimized. The transmission characteristics of EH11 mode DCN laser in free space were studied. Research shows that the use of new N2, CD4 and D2 mixed gas THz DCN laser can be stable and continuous high-power discharge. The beam transmission far field satisfies the Gaussian distribution (z> 4m). After optimizing various parameters, the output power of the EH11 at the 190μm and 195μm windows are 0.15W and 0.16W, respectively, which can meet the interference measurement of the continuous operation of the superconducting Tokamak Need.