Comparisons of properties among three type bessel resonators at MM- and SubMM-wavelengths

In the present paper, three type Bessel resonators at mm- and submm-wavelengths, which are a stable Bessel-Gauss resonator, an unstable Bessel-Gauss resonator, and a Bessel resonator, respectively, are constructed by the quasi-optical theory and techniques. To analyze the designed resonators precisely, the algorithm named as iterative dyadic Green's functions (IDGF) is adopted, which can output the three-dimension (3-D) resonating modes in the cavity. The comparison results are given in this paper. The Bessel-type beams would found their promising applications in the MM- and/or quasi-optical imaging and measurement systems.