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arXiv 2601.04470physics.optics
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通过非均匀频距的频率梳实现自混频光谱学

Self-heterodyne spectroscopy via a non-uniformly spaced frequency comb

State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Laser Spectroscopy(山西大学量子光学技术与器件国家重点实验室激光波谱学研究所);Shanxi University(山西大学极端光学协同创新中心);Collaborative Innovation Center of Extreme Optics;Shanxi University

Bofeng Zhang, Gang Zhao, Xiaobin Zhou, Xiaojuan Yan, Jiaqi Yang, Weiguang Ma, Suotang Jia

AI总结:

本文提出了一种通过非均匀频距频率梳实现高灵敏度、高分辨率和高速度的自混频光谱系统,解决了时间分辨光谱分析中的核心权衡问题。

摘要:

频率梳光谱学在分子光谱学的科学研究和广泛应用中取得了显著进展。在其中的关键性能指标,尤其是时间分辨研究中,灵敏度和测量速度是最重要的。然而,这两个参数之间长期存在的权衡来自于噪声减少的需要。在这里,我们介绍了一种梳光谱系统,通过使用一个非均匀频距模式的单频率梳来克服这一限制。该梳通过一个极其简单的设置生成,由连续波(CW)光纤激光器和单边带相位调制器(SSM)组成。我们的方法提供的光到射频转换性能与双梳光谱学(DCS)相当,但通过简化了的自混频架构。利用梳的内在互相关性,该设计实现了噪声等效吸收系数(NEA)为5.0*10^(-6) Hz^(-1/2),比最先进的DCS提高了一个数量级,同时具有长期稳定性。该系统在纳秒时间尺度上以单次测量的方式分辨弱分子倍频光谱,信噪比为128。这种高灵敏度、分辨率和速度的结合解决了长期以来限制时间分辨光谱分析的核心权衡。

英文摘要:

Frequency comb spectroscopy has significantly advanced molecular spectroscopy across scientific research and diverse applications. Among its key performance metrics especially for time-resolved studies, sensitivity and measurement speed are paramount. However, a long-standing compromise between these parameters arises from the need for noise reduction. Here, we introduce a comb spectroscopy system that overcomes this limitation using a single frequency comb of non-uniformly spaced modes. The comb is generated using an extremely simple setup, composed of a continuous-wave (CW) fiber laser and a single-sideband phase modulator (SSM). Our approach delivers optical-to-radio-frequency conversion comparable to dual-comb spectroscopy (DCS) but through a simplified self-heterodyning architecture. By leveraging the intrinsic mutual coherence of the comb, this design achieves a noise-equivalent absorption coefficient (NEA) of 5.0*10^(-6) Hz^(-1/2)--an order-of-magnitude improvement over state-of-the-art DCS, coupled with long-term stability. The system resolves weak molecular overtone spectra on nanosecond timescales, in a single-shot measurement, at a signal-to-noise ratio of 128. This integration of high sensitivity, resolution, and speed resolves the core trade-off that has long constrained time-resolved spectroscopic analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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