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| 自适应太赫兹光梳光谱系统研究 |
| Study on adaptive terahertz comb spectroscopy system |
| 投稿时间：2024-03-08 |
| DOI：10.3969/j.issn.1005-5630.202403080046 |
| 中文关键词: 太赫兹 自适应时钟 强度抖动 梳齿线宽 |
| 英文关键词:terahertz adaptive clock intensity jitter the linewidth of the comb |
| 基金项目:国家自然科学基金（62375173，61927813） |
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| 摘要点击次数: 1061 |
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| 中文摘要: |
| 搭建基于异步取样的太赫兹光谱探测系统，利用两台连续激光器与泵浦太赫兹天线的脉冲激光进行拍频，提取脉冲激光光源的时间抖动，将其作为自适应时钟信号，进而利用该时钟信号对产生的太赫兹脉冲进行采集，实现对太赫兹取样过程中时间抖动的动态补偿，最终完成对太赫兹光梳光谱的高精度探测。通过改变自适应时钟与采样信号的时域延时关系，分析太赫兹脉冲及泵浦激光脉冲在时域上的峰值强度抖动和在频域上的梳齿线宽。实验证明，在拍频后增加自适应时钟时域延时，太赫兹信号在时域上峰值强度抖动具有高稳定性，在频域上太赫兹区域具有高分数精度，并测得自适应太赫兹光梳光谱系统在0.4 THz频段的梳齿线宽为673.2 kHz。 |
| 英文摘要: |
| 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 jitter 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 jitter 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 jitter 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 0.4 THz region of the adaptive terahertz comb spectrum system was 673.2 kHz. |
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