Investigation of Quasi-Optical Bessel-Gauss Resonator at Mm- And Submm-Wavelengths

Abstract

Abstract-A research of a quasi-optical Bessel-Gauss resonator (QOBGR) at millimeter (MM) and submillimeter (SubMM) wavebands is presented in this paper. The design is based on the quasioptical theory and technique. The iterative Stratton-Chu formula (ISCF) algorithm is employed to analyze the output characteristics of the cavity, including the resonant modes, phases, power losses and phase shifts. Analysis of the results demonstrates that the present design of the QOBGR can support zero order or any high order mode of the pseudo Bessel-Gauss beam. At the output plane the intensity distributions of these modes are modulated by a Gauss-shaped envelope, and their phase patterns have an approximate block-like profile. Tolerance analysis for the designed QOBGR is also done. Lastly, a comparison of resonating modes is made between QOBR (quasi-optical Bessel resonator) and QOBGR when both are configured with the same geometric parameters.

Analysis of Mm-Wave Bands Quasi-Optical Unstable Bessel-Gauss Resonator by Idgf Algorithm

“…Fig. 2(a), respectively, one can infer that the resonant mode is an approximation to zero-order Bessel-Gauss beam, known as the pseudo Bessel-Gauss beam [20].…”

“…Therefore, to produce Bessel-Gauss beam, we can design a resonator that consists of a conical mirror and a spherical mirror. Provided that the spherical mirror is concave, one can form a quasi-optical stable Bessel-Gauss cavity [20]. On the contrary, a convex spherical mirror can be employed to model a quasi-optical unstable Bessel-Gauss resonator (QOUBGR), as illustrated in Fig.…”

“…Consequently, the Fox-Li algorithm is unfit to analyze the resonator at millimeter wavelengths. To conquer this problem, in our previous work [19,20], we had developed an iterative method named as ISCF algorithm, in which the Stratton-Chu formula is utilized to calculate the electromagnetic field in the resonator. On the foundation of the ISCF algorithm, now we develop a new program called as IDGF algorithm to further improve analysis precision of the cavity.…”

“…In the previous work, the Bessel resonator [19] and stable Bessel-Gauss resonator [20] were analyzed by using ISCF (iterative Stratton-Chu formula) algorithm. In the present paper, we report our latest research result.…”