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Mode Losses in Waveguide FAR-Infrared Lasers

The mode losses in hollow-circular waveguide resonators for far-infrared lasers are studied. Theoretical formalisms have been developed for the waveguide resonator which consists of both dielectric and metallic tubes with dielectric films and metallic grids deposited on mirrors and waveguide walls. Both propagation loss and the coupling loss for low-loss modes, circular magnetic and electric modes, and hybrid modes are investigated theoretically. A computer program was written to solve the equations numerically.