Opt Lett. 2023 Jul 1;48(13):3403-3406. doi: 10.1364/OL.492511.
We report on the efficient generation of broadband THz radiation based on a two-color gas-plasma scheme. Broadband THz pulses covering the whole THz spectral region, from 0.1-35 THz, are generated. This is enabled by a high-power, ultra-fast, thulium-doped, fiber chirped pulse amplification (Tm:FCPA) system and a subsequent nonlinear pulse compression stage that uses a gas-filled capillary. The driving source delivers 40 fs pulses at a central wavelength of 1.9 m with 1.2 mJ pulse energy and 101 kHz repetition rate. Owing to the long driving wavelength and the use of a gas-jet in the THz generation focus, the highest reported conversion efficiency for high-power THz sources (>20 mW) of 0.32% has been achieved. The high efficiency and average power of 380 mW of the broadband THz radiation make this an ideal source for nonlinear, tabletop THz science.
我们报告了一种基于双色气体等离子体方案的高效宽带太赫兹辐射产生方法。宽带太赫兹脉冲覆盖整个太赫兹光谱区域，从 0.1-35 太赫兹。这是通过一个高功率、超快速、掺铥光纤啁啾脉冲放大（Tm:FCPA）系统和随后使用充气管的非线性脉冲压缩级来实现的。驱动源提供中心波长为 1.9 微米、脉冲能量为 1.2 毫焦和重复率为 101 千赫兹的 40 飞秒脉冲。由于驱动波长较长，并且在太赫兹产生焦点处使用了气体喷射，因此实现了高达 0.32%的高功率太赫兹源（>20 毫瓦）的最高报道转换效率。宽带太赫兹辐射的高效率和平均功率为 380 毫瓦，使其成为非线性、台式太赫兹科学的理想光源。
