研究目的
Investigating the generation of terahertz (THz) radiation in carbon dioxide (CO2) at different levels of gas pressure and understanding the mechanisms behind optical-terahertz conversion (OTC).
研究成果
The study demonstrates that gas pressure is a significant factor in the efficiency of THz generation, with optimal conditions found at specific pressures. The interplay between transient photocurrent and medium nonlinearity affects THz radiation intensity and spectral properties.
研究不足
The study is limited by the range of gas pressures and temperatures that can be achieved in the experimental setup, as well as the detection capabilities of the THz radiation at high pressures.
1：Experimental Design and Method Selection:
The study used a two-color laser scheme with fundamental and second harmonics of a Ti:Sa laser to generate THz radiation in CO2 at varying pressures.
2：Sample Selection and Data Sources:
CO2 with purity of
3：99% was used as the medium, with pressure varied from 0 to 250 bar. List of Experimental Equipment and Materials:
A modular high-pressure gas cuvette with sapphire windows, Ti:Sa regenerative amplifier, BBO crystal for second harmonic generation, off-axis parabolic mirror, and a silicon bolometer detector.
4：Experimental Procedures and Operational Workflow:
Laser pulses were focused into the cuvette, and THz radiation was collected and analyzed using a Michelson interferometer and bolometer.
5：Data Analysis Methods:
The THz spectrum was reconstructed using Fourier transform of the THz signal autocorrelation function.
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