自适应太赫兹光梳光谱系统研究

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中图分类号：TN247文献标志码：A

Abstract： A terahertz spectrum detection system was built based on asynchronous optical sampling，and two continuous lasers in the system were used to generate beat frequency with the pulsed laser used as the pump source of the terahertz antenna.The timing jiter of the pulsed laser source was extracted as an adaptive clock signal for sampling the generated terahertz pulses， achieving real-time compensation for the time jiter during the terahertz sampling process， and thus achieving the high-precision detection of the terahertz comb spectrum was realized. Then， the peak intensity jitter of the terahertz pulse and the pumped laser pulse in the time domain and the linewidth of the comb in the frequency domain were analyzed by changing the time-domain delay relationship between the adaptive clock and the sampled signal. Experimental results showed that the peak intensity jiter of terahertz had high stability in time domain and high fractional accuracy in frequency domain when the adaptive clock time delay was increased after the beat frequency. The linewidth of the comb in the 0.4THz region of the adaptive terahertz comb spectrum system was 673.2kHz

Keywords： terahertz; adaptive clock; intensity jitter; the linewidth of the comb

引言

光学频率梳具有高频谱精度和高光谱分辨率，在时域上表现为等时间间距的激光脉冲序列，在频域上表现为等频率间距分布的梳齿线。（剩余9354字）