Buldt Joachim, Stark Henning, Müller Michael, Grebing Christian, Jauregui César, Limpert Jens
Opt Lett. 2021 Oct 15;46(20):5256-5259. doi: 10.1364/OL.442374.
We present a high-power source of broadband terahertz (THz) radiation covering the whole THz spectral region (0.1-30 THz). The two-color gas plasma generation process is driven by a state-of-the-art ytterbium fiber chirped pulse amplification system based on coherent combination of 16 rod-type amplifiers. Prior to the THz generation, the pulses are spectrally broadened in a multipass cell and compressed to 37 fs with a pulse energy of 1.3 mJ at a repetition rate of 500 kHz. A gas-jet scheme has been employed for the THz generation, increasing the efficiency of the process to 0.1%. The air-biased coherent detection scheme is implemented to characterize the full bandwidth of the generated radiation. A THz average power of 640 mW is generated, which is the highest THz average power achieved to date. This makes this source suitable for a variety of applications, e.g., spectroscopy of strongly absorbing samples or driving nonlinear effects for the studies of material properties.
我们展示了一种高功率宽带太赫兹（THz）辐射源，其覆盖了整个太赫兹光谱区域（0.1 - 30 THz）。双色气体等离子体产生过程由基于16个棒状放大器相干组合的先进镱光纤啁啾脉冲放大系统驱动。在产生太赫兹之前，脉冲在多程池中进行光谱展宽，并在重复频率为500 kHz时压缩至37 fs，脉冲能量为1.3 mJ。已采用气体喷射方案来产生太赫兹，将该过程的效率提高到了0.1%。采用空气偏置相干检测方案来表征所产生辐射的全带宽。产生了640 mW的太赫兹平均功率，这是迄今为止所实现的最高太赫兹平均功率。这使得该源适用于各种应用，例如，对强吸收样品进行光谱分析或驱动非线性效应以研究材料特性。
