描述一种基于高速光学异步采样(ASOPS)方法的太赫兹光谱数据采集系统，使用两台重频差为50 Hz的飞秒脉冲激光器分别作为泵浦光和探测光；使用LT-InGaAs/InAlAs光电导天线产生和接收太赫兹信号，使用采样率可调、采样模式可选的数据采集系统采集时域信号和获取光谱。试验得到的谱宽为0.06~4 THz，信噪比大于60 dB。在301.6 Msa/s的采样率和50 Hz扫描频率下，试验测量的水蒸气吸收光谱中吸收线的频率与HITRAN数据库中公布的非常接近，最大误差为12 GHz。

A terahertz optical comb spectral data acquisition system based on high-speed optical asynchronous sampling (ASOPS) method is described. Two femtosecond pulse lasers with a repetition frequency difference of 50 Hz are used as the pump light and the probe light respectively. LT-InGaAs/InAlAs optical antenna is used to generate and receive terahertz signals, and a RF data acquisition system with adjustable sampling rate and optional sampling mode is used to collect time-domain signals and analyze spectral transformation. The spectral width is 0.06~4 THz and the SNR is greater than 60 dB. At the sampling rate of 301.6 MSa/s and the scanning frequency of 50 Hz, the frequency of absorption lines in the experimentally measured water vapor absorption spectrum is very close to that published in the HITRAN database, with a maximum error of 12 GHz.