Noe G Timothy, Katayama Ikufumi, Katsutani Fumiya, Allred James J, Horowitz Jeffrey A, Sullivan David M, Zhang Qi, Sekiguchi Fumiya, Woods Gary L, Hoffmann Matthias C, Nojiri Hiroyuki, Takeda Jun, Kono Junichiro
Opt Express. 2016 Dec 26;24(26):30328-30337. doi: 10.1364/OE.24.030328.
We have developed a single-shot terahertz time-domain spectrometer to perform optical-pump/terahertz-probe experiments in pulsed, high magnetic fields up to 30 T. The single-shot detection scheme for measuring a terahertz waveform incorporates a reflective echelon to create time-delayed beamlets across the intensity profile of the optical gate beam before it spatially and temporally overlaps with the terahertz radiation in a ZnTe detection crystal. After imaging the gate beam onto a camera, we can retrieve the terahertz time-domain waveform by analyzing the resulting image. To demonstrate the utility of our technique, we measured cyclotron resonance absorption of optically excited carriers in the terahertz frequency range in intrinsic silicon at high magnetic fields, with results that agree well with published values.
我们开发了一种单次太赫兹时域光谱仪，用于在高达30 T的脉冲强磁场中进行光泵浦/太赫兹探测实验。用于测量太赫兹波形的单次探测方案采用了一个反射式阶梯光栅，在光闸光束与碲化锌探测晶体中的太赫兹辐射在空间和时间上重叠之前，在光闸光束的强度分布上产生时间延迟的子光束。在将光闸光束成像到相机上之后，我们可以通过分析所得图像来检索太赫兹时域波形。为了证明我们技术的实用性，我们在高磁场下测量了本征硅中太赫兹频率范围内光激发载流子的回旋共振吸收，结果与已发表的值非常吻合。
