Abstract

We synthesized tunable far-infrared radiation at frequencies higher than 9  THz 300 cm-1 by mixing CO2 laser, 15NH3 laser, and microwave radiation in a W–Co metal–insulator–metal diode. We used this far-infrared radiation to accurately measure torsion–rotation transitions of CH3OH in the 8–9-THz region. We also measured the frequency of the aP7,3 15NH3 laser transition.

© 1999 Optical Society of America

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