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全光纤自由运转双梳光谱技术研究。

An Investigation of All Fiber Free-Running Dual-Comb Spectroscopy.

机构信息

College of Science, Donghua University, Shanghai 201620, China.

Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai 201800, China.

出版信息

Sensors (Basel). 2023 Jan 18;23(3):1103. doi: 10.3390/s23031103.

DOI:10.3390/s23031103
PMID:36772144
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9920923/
Abstract

A dual-comb spectroscopy (DCS) system uses two phase-locked optical frequency combs with a slight difference in the repetition frequency. The spectrum can be sampled in the optical frequency (OF) domain and reproduces the characteristics in the radio frequency (RF) domain through asynchronous optical sampling. Therefore, the DCS system shows great advantages in achieving precision spectral measurement. During application, the question of how to reserve the mutual coherence between the two combs is the key issue affecting the application of the DCS system. This paper focuses on a software algorithm used to realize the mutual coherence of the two combs. Therefore, a pair of free-running large anomalous dispersion fiber combs, with a center wavelength of approximately 1064 nm, was used. After the signal process, the absorption spectra of multiple species were simultaneously obtained (simulated using the reflective spectra of narrow-bandwidth fiber Bragg gratings, abbreviated as FBG). The signal-to-noise ratio (SNR) could reach 13.97 dB (25) during the 100 ms sampling time. In this study, the feasibility of the system was first verified through the simulation system; then, a principal demonstration experiment was successfully executed. The whole system was connected by the optical fiber without additional phase-locking equipment, showing promise as a potential solution for the low-cost and practical application of DCS systems.

摘要

双梳光谱（DCS）系统使用两个相位锁定的光学频率梳，它们的重复频率略有差异。该光谱可以在光频（OF）域中进行采样，并通过异步光采样在射频（RF）域中再现特征。因此，DCS 系统在实现精密光谱测量方面具有很大的优势。在应用中，如何保留两个梳之间的互相干性是影响 DCS 系统应用的关键问题。本文重点介绍了一种用于实现两个梳之间互相干性的软件算法。因此，我们使用了一对自由运行的大反常色散光纤梳，其中心波长约为 1064nm。经过信号处理后，同时获得了多种物质的吸收光谱（使用窄带宽光纤布拉格光栅的反射光谱进行模拟，简称 FBG）。在 100ms 的采样时间内，信号噪声比（SNR）可达到 13.97dB（25）。在本研究中，我们首先通过仿真系统验证了系统的可行性；然后，成功执行了主要的演示实验。整个系统通过光纤连接，没有额外的锁相设备，有望成为低成本、实用的 DCS 系统的潜在解决方案。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/948bd35c53c8/sensors-23-01103-g018.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/948bd35c53c8/sensors-23-01103-g018.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/b77b8f3a00c3/sensors-23-01103-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/5d96599ef973/sensors-23-01103-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/87ca75ba8710/sensors-23-01103-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/33e03143a232/sensors-23-01103-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/86999ab27c83/sensors-23-01103-g015.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/d0c64ed2e3ba/sensors-23-01103-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/804c6fc72d1d/sensors-23-01103-g017a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8cd1/9920923/948bd35c53c8/sensors-23-01103-g018.jpg

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