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<正>A high energy pulsed terahertz(THz) laser is studied experimentally.The laser cavity simply consists of a quartz glass waveguide,a coated GaAs input window,and a crystal quartz output window.NH3 is filled in the cavity as gain medium,and pumped by an 8-J line-tunable transversely excited atmospheric(TEA) CO_2 laser.When 9R(16) transition acts as the pump line,55.6-mJ THz radiation(90μm) is obtained at 730-Pa NH_3 pressure.The corresponding conversion efficiency is 13.54%.Energy and optimal pressure of amplified spontaneous emission and laser oscillation are compared. 相似文献
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This paper describes a new multi-layer complex liquid-cooled Si mirror with 3 cooling ducts in Archimedes spirals. Utilizing the ANSYS program, the structure of the mirror is optimized and the thermal deformation model of the mirror is simulated. The simulation results show that the mirror has the following advantages:very small amount of surface deformation, uniform distribution of temperature and surface deformation,and fast surface shape restoration. The results of the experiments of thermal deformation and the surface restoration are accurately mapped to the simulation results. 相似文献
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从均匀场电极理论出发,计算并讨论了近似Rogowski电极、Chang电极(含紧凑式Chang电极)和Ernst电极的形状、理论电场分布和实际电场分布。对实验室所用的几种电极进行了脉冲放电实验,从而获得了TEA CO2激光器的放电参数与输出特性,并对这些结果进行了比较和分析。计算表明,在基本参数相同的情况下,Ernst电极具有最紧凑的外形和最佳的均匀电场分布。实验表明,采用近似Rogowski电极的TEA CO2激光器具有最大放电辉光范围和44 kV的最小放电击穿电压;采用Ernst电极的TEA CO2激光器具有25 J的最高单脉冲能量和最大17.2%的斜率效率。最后提出了TEA CO2激光器主电极的选择建议。 相似文献
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Output characteristics of right angle cone mirror cavity laser 总被引:1,自引:0,他引:1
The anti-misalignment stability and output characteristics of the right angle cone cavity laser are experimentally studied. When the misalignment angle of the cone mirror turns to 46.8 minutes, the single-pulse output energy of the piano-cone cavity laser decreases 24% and the near-field beam patterns have little change; as for the beam directional stability, when the measuring place stands 3.12 m in front of the output mirror, the near-field beam patterns of the piano-cone laser are located at the primary places until the misalignment angle of the cone mirror turns to 18 minutes. These results show that the piano-cone cavity laser has better performances in comparison with the plano-concave cavity laser.The analytical results of the mode instrument are also obtained, which show that the near-field beam intensity distribution of the piano-cone mirror cavity laser is near to the plane wave. 相似文献
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为了获得较窄增益带宽、较大光强的太赫兹辐射,尝试了利用TEA CO2激光器对6 W可调谐连续波CO2种子激光实行双程光放大实验,以期望获得长脉冲、高峰值功率的抽运光.通过实验,获得了大约30倍的放大系数,放大光输出功率随种子光注入功率的增加而增加,其中10 P (20)支线表现更加突出,并且被放大的激光支线半峰全宽在14 μs左右.基于这种长脉冲抽运源,建立了一种产生脉冲太赫兹的动力学模型,给出了产生太赫兹辐射的饱和抽运光强表达式,确定了抽运光的光强范围.另外,
关键词:
激光物理
长脉冲
动力学模型
太赫兹激光 相似文献
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保持CO2激光的单脉冲能量为61.4~64.6 J,采用高精度冲击摆系统进行了不同气压下吸气模式激光推进冲量耦合系数的实验测试,分析了对应的高度特性。结果表明:气压为2.8×104~1×105 Pa,即距离地面0~10 km时,冲量耦合系数大约3.5×10-4 N·s·J-1,上下波动幅度低于5%;气压低于2.8×104 Pa,即高度大于10 km时,冲量耦合系数呈二次曲线显著下降;当气压降至1×103 Pa,即距离地面约31 km高度时,耦合系数仅为9.7×10-5 N·s·J-1。 相似文献
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