From backward THz difference-frequency generation to parametric oscillation
From backward THz difference-frequency generation to parametric oscillation
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DOI：
10.1109/jstqe.2006.871953
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发表时间：
2006-06
影响因子：
4.9
通讯作者：
Y.J. Ding;Wei Shi
中科院分区：
文献类型：
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作者：
Y.J. Ding;Wei Shi
利用两束红外激光在两个GaSe晶体中混频，观察到了太赫兹（THz）波段的后向差频产生。对于47 mm长的晶体，输出波长可以在167.6-2060 /spl mu/m（0.146-1.79 THz）的宽范围内调谐，而峰值输出功率可以高达217 W。相应的功率转换效率被确定为约0.03%。在这些实验结果的基础上，我们的计算表明，峰值输出强度可以按比例放大到一个水平，这是足够高的探索新的非线性效应在太赫兹区域。此外，我们还讨论了为其中一束混频光引入腔以提高后向DFG转换效率的可能性。考虑到所有的重要问题后，我们已经表明，后向参量振荡在太赫兹区域是可行的，通过使用几个晶体在最佳泵浦条件下。
We have observed the backward difference-frequency generation (DFG) in two GaSe crystals in the terahertz (THz) region by mixing two infrared laser beams. For a 47-mm-long crystal, the output wavelength can be tuned in a wide range of 167.6-2060 /spl mu/m (0.146-1.79 THz), whereas the peak output power can be as high as 217 W. The corresponding power conversion efficiency is determined to be about 0.03%. On the basis of these experimental results, our calculations show that peak output intensity can be scaled up to a level which is sufficiently high for exploring novel nonlinear effects in the THz region. Furthermore, we have discussed the possibility of including a cavity for one of the mixing beams to enhance the conversion efficiencies for the backward DFG. After taking into consideration all the important issues, we have shown that the backward parametric oscillation is feasible in the THz region by using a few crystals under the optimum pumping conditions.