Opt Lett. 2013 Nov 15;38(22):4793-6. doi: 10.1364/OL.38.004793.
We demonstrate a highly efficient and compact terahertz cavity oscillator that is based on z-cut crystal quartz used as the dichroic beam splitter, for the first time to the best of our knowledge. With D(2)O gas as the active medium, pumped with a multitransverse mode TEACO(2) laser, experimental verification was also presented to demonstrate the advantages of this cavity oscillator. With the cavity length of 120 cm, 7.4 mJ pulse energy at pulse repetition frequency of 6 Hz, pulse width of 90 ns, and peak power of 82.2 kW were achieved at a wavelength of 385 μm. Photon conversion efficiency (PCE) of 44% was obtained at the maximum output level from this terahertz cavity oscillator. Furthermore, to our knowledge, this PCE is the highest efficiency ever reported in D(2)O gas, 385 μm terahertz cavity laser systems. The beam quality or M(2) factor was found to be about 1.77.
我们首次展示了一种基于 z 切晶体石英的高效紧凑型太赫兹腔振荡器，该振荡器用作二向色分束器。 我们还使用 D(2)O 气体作为活性介质，使用多横模 TEACO(2) 激光进行泵浦，实验验证了这种腔振荡器的优势。 在腔长为 120 cm 的情况下，在脉冲重复频率为 6 Hz、脉宽为 90 ns、峰值功率为 82.2 kW 的条件下，在 385 μm 波长处获得了 7.4 mJ 的脉冲能量。 在太赫兹腔振荡器的最大输出水平下，获得了 44%的光子转换效率（PCE）。 此外，据我们所知，这一 PCE 是在 D(2)O 气体、385 μm 太赫兹腔激光系统中报告的最高效率。 光束质量或 M(2)因子约为 1.77。
