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首页> 外文期刊>Journal of Infrared, Millimeter, and Terahertz Waves >Study of Optimal Cavity Parameter in Optically Pumped D2O Gas Terahertz Laser
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Study of Optimal Cavity Parameter in Optically Pumped D2O Gas Terahertz Laser

机译:光泵浦D2 O太赫兹激光的最佳腔参数研究

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Heavy water gas (D2O gas) which owns special structure property, can generate terahertz radiation by optically pumping technology, and its 385 μm 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-CO2 laser 9R (22) output line (λ = 9.26 μm) acted as pumping source, D2O gas molecules were operating medium, the expressions of pumping absorption coefficient G p and Terahertz signal gain coefficient G s were deduced. It was shown that the gain of Terahertz signal was related with the energy-level parameters of operating molecules and some operating parameters of the Terahertz laser cavity, mainly including cavity length. By means of iteration method, the output power density of Terahertz pulse signal was calculated numerically. Changing the parameter of cavity length and keeping others steady, the relationship curve between the output power intensity (Is) of Terahertz pulse laser and the operating cavity length (L) was obtained. The curve showed that the power intensity (Is) increased with cavity length (L) in a certain range, but decreased when the length (L) exceeded some value because of the absorption effect, and there was an optimal cavity length for the highest output power. We used a grating tuned TEA-CO2 laser as pumping power and a sample tube of variable length in 70–160 cm as terahertz laser operating cavity to experiment. The results of theoretical calculation and experiment matched with each other, and it is helpful for miniaturizing terahertz laser volume to make it practical.
机译:具有特殊结构性质的重水煤气(D2O)可以通过光泵浦技术产生太赫兹辐射,其385μm波长辐射可以被广泛使用。本研究在半经典密度矩阵理论的基础上,建立了三级能量系统作为理论模型,即TEA-CO2 激光器9R(22)输出线(λ= 9.26μm)。作为泵浦源,以D2 O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。结果表明,太赫兹信号的增益与工作分子的能级参数以及太赫兹激光腔的一些工作参数有关,主要包括腔长。通过迭代方法,数值计算出太赫兹脉冲信号的输出功率密度。改变腔长参数并使其他参数保持稳定,得到太赫兹脉冲激光器的输出功率强度(Is)与工作腔长(L)之间的关系曲线。曲线表明,功率强度(Is)在一定范围内随腔长(L)的增加而增大,但由于吸收效应,当长度(L)超过一定值时,功率强度(Is)减小,并且有一个最佳腔长以实现最高输出功率。我们使用光栅调谐的TEA-CO2 激光器作为泵浦功率,并使用70-160 cm变长的样品管作为太赫兹激光器的工作腔进行实验。理论计算和实验结果相互吻合,有助于使太赫兹激光体积小型化使其实用化。

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