High efficiency THz pulse generatin with a regenerative optical-rectification

采用再生光整流的高效太赫兹脉冲发生器

• 批准号: 24760044
• 负责人: NAGAI Masaya
• 金额: $ 2.25万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760044/
• 关键词: テラヘルツ; 高効率; 超短光パルス; 光整流; 高強度; 非線形光学; 非線形結晶; テラヘルツ光; 波長変換; THz波発生; テラヘルツ; 高効率; 超短光パルス; 光整流; 高強度; 非線形光学; 非線形結晶; テラヘルツ光; 波長変換; THz波発生

We experimentally demonstrate the generation and detection of broadband THz pulses with a bandwidth extending beyond 4 THz by using a 1.04-um Yb-doped fiber laser with a pulse duration of 0.48 ps. Owing to higher-order nonlinear processes in LiNbO3 crystals, THz pulses can be emitted efficiently with a bandwidth extending beyond the boundaries of the spectral width of the excitation pulse. By compressing divided sampling pulses to as short as 80 fs, we detected the THz pulse in the full spectral range, which could not be resolved with the original pulse. The precise control of the nonlinear effects and the compression of the sampling pulses compensated for the disadvantage of using a 1-um fiber laser. This work will contribute to the progress of nonlinear THz spectroscopy and imaging.

我们通过实验表明，通过使用1.04-UM YB掺杂的纤维激光器，脉冲持续时间为0.48 ps，具有带宽超过4 THz的宽带THZ脉冲的产生和检测。由于LINBO3晶体中的高阶非线性过程，THZ脉冲可以通过带宽延伸到激发脉冲的光谱宽度的边界上有效发射。通过将分隔的采样脉冲压缩至80 fs，我们在整个光谱范围内检测到THZ脉冲，无法用原始脉冲解决。非线性效应的精确控制和采样脉冲的压缩补偿了使用1-UM纤维激光器的缺点。这项工作将有助于非线性THZ光谱和成像的进展。