Abstract
A CO2 TEA laser was used for optical pumping of 14NH3. Thirteen CO2 lines, which deviate by 0.05 cm-1 or less from transitions in 14NH3, were effective in producing submillimeter laser transitions. Most of the 24 emitted lines have wavelengths between 70 and 400 μm and represent rotation-inversion transitions in the ν2 state of NH3. A few short wavelength lines (30-70 μm) are 2ν2 transitions obtained by pumping from the ν2 state.The influence of pressure, resonator length and outcoupling on the appearance of the submillimeter lines was investigated. The choice of parameters was not critical for observing the lines, which in general had high gain. Each pump pulse delivered 1-50 mJ in 150 ns to the NH3 gas. Some submillimeter lines persisted up to an NH3 pressure of 30-70 torr or to 300-400 torr in a mixture of NH3 and He.
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