Direct observation of the differences between Raman scatering and population inversion transition for their emission frequencies and pulse waveforms |
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Authors: | Yoshio Nishi and Koreyuki Tunashima |
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Institution: | (1) Department of Applied Physics, Faculty of Engineering, Osaka City University, Sumiyoshiku, Osaka 558, Japan |
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Abstract: | In FIR laser emissions optically by a CO2 laser, it has been reported that there are two different process namely induced Raman scattering and population inversion transition .In this paper, we show that the two different process have clearly different characteristics in emission frequensies and pulse waveforms in the case of a TEA-CO2 laser excitation.We used in this work an intra-cavity etalon for the study of the emission frequensies and also we used a MOM point contact diode for the detection of the wavaformes.Especially, we show that the FIR pulse waveformes are able to analyze numerically on the concept of rate equations.In conclusion, we indicate that molecules would be classified into two categories with regard to optically pumping by a TEA-CO2 laser. One of them produce mainly Raman scattered emissions, and other produce only the FIR emissions from population inversion transition in spite of high power intensity excitation. |
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