Kong Moon Sik, Kim Ji Su, Han Sang Pil, Kim Namje, Moon Kiwon, Park Kyung Hyun, Jeon Min Yong
Opt Express. 2016 Apr 4;24(7):7037-45. doi: 10.1364/OE.24.007037.
We demonstrate a terahertz (THz) radiation using log-spiral-based low-temperature-grown (LTG) InGaAs photoconductive antenna (PCA) modules and a passively mode-locked 1030 nm Yb-doped fiber laser. The passively mode-locked Yb-doped fiber laser is easily implemented with nonlinear polarization rotation in the normal dispersion using a 10-nm spectral filter. The laser generates over 250 mW of the average output power with positively chirped 1.58 ps pulses, which are dechirped to 127 fs pulses using a pulse compressor outside the laser cavity. In order to obtain THz radiation, a home-made emitter and receiver constructed from log-spiral-based LTG InGaAs PCA modules were used to generate and detect THz signals, respectively. We successfully achieved absorption lines over 1.5 THz for water vapor in free space. Therefore, we confirm that a mode-locked Yb-doped fiber laser has the potential to be used as an optical source to generate THZ waves.
我们展示了一种使用基于对数螺旋的低温生长（LTG）铟镓砷光电导天线（PCA）模块和被动锁模1030纳米掺镱光纤激光器产生太赫兹（THz）辐射的方法。通过在正常色散中使用非线性偏振旋转和一个10纳米的光谱滤波器，可以轻松实现被动锁模掺镱光纤激光器。该激光器产生超过250毫瓦的平均输出功率，输出具有正啁啾的1.58皮秒脉冲，这些脉冲在激光腔外使用脉冲压缩器被啁啾至127飞秒脉冲。为了获得太赫兹辐射，分别使用由基于对数螺旋的LTG铟镓砷PCA模块构建的自制发射器和接收器来产生和检测太赫兹信号。我们成功在自由空间中实现了超过1.5太赫兹的水蒸气吸收线。因此，我们证实锁模掺镱光纤激光器有潜力用作产生太赫兹波的光源。
