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Generating uniform irradiance in the Fresnel region by quasi-optical beam shaping of a millimeter-wave source
, Article Optics Express ; Volume 27, Issue 22 , 2019 , Pages 32135-32146 ; 10944087 (ISSN) ; Ahmadi-Boroujeni, M ; Tehranian, A ; Sharif University of Technology
OSA - The Optical Society
2019
Abstract
In this paper, we report on the design, simulation and measurement of a flat-top beam shaper (FBS) lens for a millimeter-wave (mm-wave) antenna coupled source. The beam shaper is designed to transform the pseudo-Gaussian beam of the mm-wave source into a flat-top beam of sharp roll-off at a specific distance in the Fresnel region. Firstly, relying on the geometrical optics principles, we propose an analytical formulation for the design of lens profiles. Next, a simple optimization method based on the full-wave simulation of the lens and the mm-wave antenna is suggested to tune the analytically extracted lens profile. The optimized lens profile is then studied to assess its performance...
Generating uniform irradiance in the fresnel region by quasi-optical beam shaping of a millimeter-wave source
, Article Optics Express ; Volume 27, Issue 22 , 2019 , Pages 32135-32146 ; 10944087 (ISSN) ; Ahmadi Boroujeni, M ; Tehranian, A ; Sharif University of Technology
OSA - The Optical Society
2019
Abstract
In this paper, we report on the design, simulation and measurement of a flat-top beam shaper (FBS) lens for a millimeter-wave (mm-wave) antenna coupled source. The beam shaper is designed to transform the pseudo-Gaussian beam of the mm-wave source into a flat-top beam of sharp roll-off at a specific distance in the Fresnel region. Firstly, relying on the geometrical optics principles, we propose an analytical formulation for the design of lens profiles. Next, a simple optimization method based on the full-wave simulation of the lens and the mm-wave antenna is suggested to tune the analytically extracted lens profile. The optimized lens profile is then studied to assess its performance...
Flat-top beam profile generated using a fiber-bundle prism-coupled beam shaper
, Article Optics Communications ; Volume 284, Issue 12 , June , 2011 , Pages 2817-2824 ; 00304018 (ISSN) ; Golnabi, H ; Sharif University of Technology
2011
Abstract
In this paper, an optical beam shaping system is theoretically and experimentally investigated. The optical system design software ZEMAX is used to simulate and analyze the reported beam shaping design. By using this software ray tracing diagrams are presented with the aim of studying the direct beam propagation, total reflection rays, and the lost rays. The prism duct output beam shape and radiance profiles in both position space and angle space are also studied. For experimental investigation, a two-stage beam shaping design including a fiber-bundle and a prism duct is used. A source light is used for the fiber-bundle illumination and the photograph image of the output beam is taken by a...