However, it is necessary to obtain FIR coherent sources with appropriate performance for these experiments. We should also count large power loss in quasi-optical components usually used in the submillimeter region: this demands a rather high power source (20∼30mW, > 500 ∼ 600GHz). Candidate sources for this purpose are optically pumped and discharge pumped FIR gas lasers. We have developed a high-power optically pumped FIR laser modifying an Apollo 125 model and examined its characteristics. The laser will be used as a calibration source for FIR spectroscopy and for testing submillimeter detectors and mixers, too.
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Toshihiro Hori, "Characteristics of a molecular laser optically pumped by a high-power CO2 laser for detection experiments," Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15764L (1 October 1991);