Rectangular metallic waveguide resonator performance evaluation at near-millimeter wavelengths

An experimental comparison of the performance of a far infrared (FIR) waveguide laser operating near the 1.2 mm wavelength with two different types of waveguides has been performed. The results indicate that a tall metallic rectangular waveguide has a lower threshold and produces more linearly polarized FIR power than a circular dielectric waveguide of comparable size.