Comparison of Beam Shapes and Transmission Powers of Two Prism Ducts

Design and performance of two-stage optical beam shaping system based on a plastic fiber-bundle, prism coupled waveguide, is described in this study. Such systems offer practical means to modify and change the output beam shape at two stages and also provide quantitative information concerning the output beam intensity. It is possible to investigate output power and image transmittance data by using a light source for illumination and image analysis by a CCD/digital camera. The photograph picture of the illuminating LED beam shows a circular shape with a diameter of about 10 mm at its output point. Picture of the fiber-bundle output beam is also taken, which shows a rectangular shape with a dimension of 10.4 x 1.84 mm. The final output beam cross section at the second stage beam shaping with using two different prism ducts are monitored and compared in this study. A square beam shape with a dimension of 4 x 4 mm for the prism duct #1, and a rectangular shape with a dimension of 4 x 12 mm is obtained for the prism duct #2. Output intensity of about 2.38 ^W/mm2 is obtained for the first stage of beam shaping and the overall power efficiencies of about 14.22% with prism #1, and 32.77% with the prism #2 are obtained