| Terahertz is the electronics to photonics transition, it’s unique properties make itacademic valuable and promising in national security, environmental detection, military,communications and other fields. This paper do some preliminary researches on the496μm super-radiant THz in both theory and experiment which pumping methylfluorideby TEA CO2laser9P（20） line.In the theory, the mechanism and level structure of optical pumping methylfluoride496μm radiation has been introduced. Based on three-level rate equation theory,absorption coefficient and gain coefficients of thermal equilibrium and non-equilibriumwere solved, the feasibility of the theoretical model was demonstrated. Simulated pumpenergy, pressure, laser cavity length influencing on496μm THz radiation characteristicswith matlab.In the experiment, a super-radiant THz laser system was successfully built and0.605THz,496μm,0.29mJ terahertz radiation was obtained. The pump lasertransmittance curves were measured under the fundamental transverse andmulti-transverse mode, these experimental results matched the simulation results well.The energy distribution and spot diameter of496μm THz radiation was given by the slitmethod. A F-P interferometer wavelength measurement device was built, which wasused to measure the496μm wavelength. The waveforms and pulse width of the pumplaser and THz radiation, the timing relationship between them were obtained. Combinedwith theoretical and experimental studies, we researched THz operating characteristicsby changing pump mode, pump energy, methyl fluoride operating pressure, including:the relationship between THz radiation energy and the pump energy when the operatingpressure is fixed; The relationship between THz radiation and methyl fluoride operatingpressure at the fixed pump energy; Different pump energy, pump mode influence onmethyl fluoride optimum operating pressure; Different pump mode influence on THzradiation energy and quantum efficiency. |
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