Improving the transmission efficiency of the Cassegrain optical system for Bessel–Gaussian beams

Abstract

With the improvement of the transmission efficiency, the Cassegrain antenna can be widely used in space optical communication. In this paper, the Bessel–Gaussian (BG) beam is used to avoid the central energy loss of a Cassegrain antenna system. The intensity distribution and the phase distribution of the BG beam passing through a Cassegrain antenna are theoretically derived and simulated. At a wavelength of 1550 nm, this method can theoretically improve the transmission efficiency to approach 100% under the situation in which the obscuration ratio is nonzero, and the transmission efficiency can reach more than 80% when obscuration ratio is in the range of from 0 to 0.1252 with l = 4 . The effects of on-axial defocusing on the light field and the transmission efficiency are studied. The method proposed in this paper can remarkably improve the transmission efficiency of a Cassegrain antenna in a practical and uncomplicated approach.

Cassegrain antenna using anomalously hollow beams with orbital angular momentum to improve transmission efficiency

“…Some researchers use hollow beams to avoid losing intermediate energy. For example, Laguerre-Gaussian beams (LG), Bessel-Gaussian beams (BG) [11,12] or hollow beams created by conical lenses [13,14], but LG beams is not conducive to remote transmission and BG beams generated using computerized holography have problems with energy loss due to the use of many optical elements [15].…”