Tunable compact asynchronous optical sampling system using Er-doped fiber laser

作者：Zhao, Zilin; Luo, Daping; Liu, Yang^*; Deng, Zejiang; Zhou, Lian; Xie, Gehui; Gu, Chenglin; Yang, Yanzhao; Wu, Bin; Li, Wenxue^*

来源：High Power Laser Science and Engineering, 2023, 11: e29.

DOI：10.1017/hpl.2023.21

• asynchronous optical sampling
• mode-locked fiber laser
• terahertz time-domain spectroscopy

We report a compact, tunable, self-starting, all-fiber laser-based asynchronous optical sampling (ASOPS) system. Two Er-doped fiber oscillators were used as the pulsed-laser source, whose repetition rate could be set at 100 MHz with a tuning range of 1.25 MHz through a fiber delay line. By employing phase-locked and temperature control loops, the repetition rate offset of the two lasers was stabilized with 7.13 x 10(-11) fractional instability at an average time of 1 s. Its capabilities in the terahertz regime were demonstrated by terahertz time-domain spectroscopy, achieving a spectral bandwidth of 3 THz with a dynamic range of 30 dB. The large range of repetition rate adjustment in our ASOPS system has the potential to be a powerful tool in the terahertz regime.

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