Abstract
Using the pumping light of a TEA-C02 laser with etalon tuning, we have observed more than 90 new FIR laser lines from CH3OH, CH2Cl2, C2H5OH, CF3Br, HCOOH, and D2O. These new lines are obtained from effective excitations using an etalon, which enables us to operate the TEA-CO2 laser as a tunable source with single-mode emission. Furthermore, it has been found that many FIR laser lines which were previously reported only with cw-CO2 laser pumpings also oscillate for CH3OH, HCOOH, CH3Br and CH3I. These lines and the newly discovered lines are the results of using an FIR resonator of more than 3 m in length which has a high Q-factor. The Q-factor can be calculated based on the waveforms of Raman FIR laser emissions from NH3. The waveforms are in good agreement with theoretical predictions.
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