研究目的
Demonstrating an ultrasimple free-running dual-comb spectrometer realized in a single all-fiber cavity suitable for Doppler-limited measurements.
研究成果
The demonstration of a free-running high-resolution spectroscopy using an ultrasimple, all-fiber single-cavity dual-comb laser (AFSCDCL) shows promise for a wide range of applications in laboratory and industrial environments. The combination of simple cavity design and computational phase correction algorithm enables high-quality molecular dual-comb spectra with tooth-resolved lines and subpercentage transmittance precision in a terahertz bandwidth measured in a fraction of a second.
研究不足
The free-running dual-comb fiber source may not reach the precision and accuracy of highly stabilized and absolutely referenced frequency combs. Optical frequency fluctuations on typical measurement time scales are a limitation, though they do not preclude high-quality low-pressure molecular spectra measurements.
1：Experimental Design and Method Selection:
The study employs a single all-fiber cavity for dual-comb generation, utilizing polarization multiplexing for dual-comb generation. The methodology includes computational phase retrieval and correction for high-resolution spectroscopy.
2：Sample Selection and Data Sources:
Low-pressure hydrogen cyanide (H13C14N) is used as the sample for spectroscopic measurements.
3：List of Experimental Equipment and Materials:
The setup includes an all-fiber ring cavity with a graphene-based saturable absorber, erbium-doped fiber, polarization-maintaining fiber, and a polarizing beam splitter for multiheterodyne beating.
4：Experimental Procedures and Operational Workflow:
The dual-comb laser operates in a free-running mode, with the repetition rate difference tailored by adjusting the intracavity polarization state. Spectroscopic measurements are performed with computational correction of phase fluctuations.
5：Data Analysis Methods:
The data analysis involves computational phase retrieval and correction algorithms for coherent averaging of dual-comb interferograms, enabling high-resolution spectroscopic assessments.
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