Experimental study of THz CW high-power DCN laser
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摘要: 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.Abstract: A CW THz waveguide discharge-pumped high-power DCN laser operating at 1.54THz(195μm) and 1.58THz(190μm) is developed.With 3m discharge length and 3.4m resonator length.The resonator cavity consists of a pyrex tube of(54mm) diameter and two plane reflectors against its ends.One end is a plane mirror,the other is a metal mesh.The mixture gas of N2,CD4and He(or D2) is used in DCN laser.The laser output power is 0.2W at the 1.54THz.Optimization of various parameters,such as the pressure,the discharge current and the wall temperature are studied in experiments.The free space propagation of the EH11mode of DCN laser is observed.Our experimental study has shown the feasibility of THz high-power CW discharge-pumped DCN waveguide laser with new mixture gas:N2,CD4and D2.The beam profile is found to be qualitatively Gaussian in the far-field(z4m).After optimization of various parameters,this laser delivers 0.15W and 0.16W on the 190μm and 195μm lines,respectively,for EH11mode.It fits the requirements of interferometric measurements on superconducting tokamaks for long time operation.
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Keywords:
- laser technique /
- THz laser /
- DCN laser /
- optimization output power /
- propagation property
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