研究目的
To develop a compact, efficient, and field-compatible dual-comb spectrometer for high-accuracy methane monitoring without the need for external phase locks.
研究成果
The study demonstrates a compact, efficient, and field-compatible dual-comb spectrometer for methane spectroscopy without external phase locks. It successfully interrogates the R and Q branches of methane's overtone 2ν3 simultaneously, marking a significant advancement in portable methane monitoring.
研究不足
Systematic errors include photodetector nonlinearity and line-mixing effects. The theoretical model does not account for line-mixing, leading to errors on the absorption line.
1：Experimental Design and Method Selection:
The study employs a free-running dual-comb spectrometer based on two passively mode-locked waveguide lasers integrated into a single Er-doped ZBLAN chip. The design includes fiber amplifiers and highly nonlinear fiber (HNLF) to broaden the spectral range.
2：Sample Selection and Data Sources:
A
3：5 cm long methane cell with a nominal pressure of 740 Torr is probed. List of Experimental Equipment and Materials:
The setup includes a SESAM mode-locking configuration, fiber amplifiers, HNLF, and a methane cell.
4：Experimental Procedures and Operational Workflow:
The combs are amplified, broadened into HNLF, and filtered. Interferograms are recorded and corrected using a self-sufficient algorithm.
5：Data Analysis Methods:
The transmission spectrum of methane is fitted to a theoretical model using Voigt profiles, with parameters from the HITRAN 2016 database.
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