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首页> 外文会议>Conference on Terahertz Photonics; 20071112-14; Beijing(CN) >Study of optimal gas pressure in optically pumped D_2O gas terahertz laser
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Study of optimal gas pressure in optically pumped D_2O gas terahertz laser

机译：光泵浦D_2O气体太赫兹激光器的最佳气压研究

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Heavy water vapor (D_2O gas) which owns special structure properties, can generate terahertz (THz) radiation by optically pumped technology, and its 385 um wavelength radiation can be widely used. In this research, on the base of semi-classical density matrix theory, we set up a three-level energy system as its theoretical model, a TEA-CO_2 laser 9R (22) output line (λ=9.26 urn) acted as pumping source, D_2O gas molecules were operating medium, the expressions of pumping absorption coefficient G_p and THz signal gain coefficient G_s were deduced , It was shown that the gain of THz signal was related with the energy-level parameters of operating molecules and some operating parameters of the THz laser cavity, mainly including gas pressure, temperature etc.; By means of iteration method, the output power density of THz pulse signal was calculated numerically as its initial power density was known; Changing the parameter of gas pressure and keeping others steady, the relationship curve between the output power intensity (Is) of Tera-Hz pulse laser and the operating D_2O gas pressure (P) was obtained. The curve showed that the power intensity (Is) increased with gas pressure (P) in a certain range, but decreased when the pressure (P) exceeded some value because of the bottleneck effect, and there was an optimal gas pressure for the highest output power. We used a grating tuned TEA-CO_2 laser as pumping power and a sample tube of 97cm length as THz laser operating cavity to experiment. The results of theoretical calculation and experiment matched with each other.
机译：重水蒸气（D_2O气体）具有特殊的结构特性，可通过光泵技术产生太赫兹（THz）辐射，其385 um波长辐射可被广泛使用。本研究在半经典密度矩阵理论的基础上，建立了三能级能量系统作为理论模型，以TEA-CO_2激光器9R（22）输出线（λ= 9.26 urn）为泵浦源。 ，D_2O气体分子为工作介质，推导了泵浦吸收系数G_p和太赫兹信号增益系数G_s的表达式，表明太赫兹信号的增益与工作分子的能级参数和分子的一些工作参数有关。太赫兹激光腔，主要包括气压，温度等；通过迭代法，数值计算了太赫兹脉冲信号的输出功率密度，因为其初始功率密度已知。改变气压参数并使其他参数保持稳定，得到了太赫兹脉冲激光的输出功率强度（Is）与工作D_2O气压（P）之间的关系曲线。该曲线表明，功率强度（Is）在一定范围内随气压（P）的增加而增加，但由于瓶颈效应，当气压（P）超过一定值时，功率强度（Is）减小，并且有一个最高输出功率的最佳气压功率。我们使用光栅调谐的TEA-CO_2激光器作为泵浦功率，并使用97cm长的样品管作为THz激光器工作腔进行实验。理论计算和实验结果相互匹配。

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