A high power optically-pumped submillimeter oscillator for use in plasma diagnostics has been developed which employs an unstable resonator cavity. This oscillator has been operated using CH3I(447 μm), CH3F (496 μm) and D20(385/361 μm). The peak power output varied from approximately 40 kW with CH3I to 200 kW with D20.
D. P. Hutchinson, D. P. Hutchinson,
"Oak Ridge National Laboratory Plasma Diagnostic Research", Proc. SPIE 0105, Far Infrared/Submillimeter Wave: Technology/Applications, (26 August 1977); doi: 10.1117/12.955443; https://doi.org/10.1117/12.955443