研究目的
Investigating the saturation spectroscopy of carbon dioxide inside a hollow glass waveguide using a tunable mid-infrared difference frequency generation source.
研究成果
The study successfully demonstrated mid-IR saturation spectroscopy of CO2 inside a hollow glass waveguide with a DFG power <0.2 mW, achieving a high contrast dip signal. The linewidth of the dip was determined to be 4.40 MHz. The method presents a robust and simple design for measuring mid-IR saturation spectroscopy without the need for a build-up cavity or other enhancement schemes.
研究不足
The linewidth of the dip was broader than the sum of transit time and pressure broadening, possibly due to multimode propagation in the hollow GW and DFG frequency fluctuations. A smaller diameter hollow GW and a more stable DFG source could improve results.
1：Experimental Design and Method Selection:
The experiment utilized a tunable mid-infrared difference frequency generation (DFG) source for saturation spectroscopy inside a hollow glass waveguide (GW). The DFG source was generated in a periodically poled lithium niobate crystal.
2：Sample Selection and Data Sources:
The study focused on the R(60) transition of CO2 at
3：2 μm inside a hollow GW. List of Experimental Equipment and Materials:
Equipment included a master oscillator power amplifier (MOPA) laser system, a monolithic non-planar ring oscillator Nd:YAG laser, a 10-W fiber amplifier, a MgO:PPLN crystal, and a hollow GW.
4：Experimental Procedures and Operational Workflow:
The DFG source was tuned and focused into the GW, and the transmitted radiation was analyzed.
5：Data Analysis Methods:
The linewidth of the saturation dip was determined using a lock-in amplifier and fitting the data to an analytical function.
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