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23 August 1996 Characterization of a three-spot lens for an optical fiber multiple connection
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A monolithic optical component able to focus a medium or high power laser beam in three different points on the same plane has been designed and constructed. The three-spot lens is constituted by an asymmetrical refractive lens. A face has been conventionally rounded in a convex shape, while the other face has a prismatic shape in order to split the laser beam in three parts. The optical characteristics of the three-spot lens (focal length, focal spot sizes, mutual distance between spots an spherical aberration) were evaluated in first approximation by extending the matrix optics method to misaligned systems. An experimental characterization of the lens has substantially confirmed the results of the theoretical analysis and it has shown that the lens can be conveniently used to design a device for simultaneous coupling of a number of large-diameter optical fibers to a medium or high power laser source (laser- multifiber coupler) or to a single launching fiber (fiber- multifiber coupler). The laser power can be uniformly coupled into the receiving fibers; it was verified that an asymmetrical power distribution between the fibers can be obtained as well.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vera Russo, Gemma De Angelis, Antonio Scaglione, and V. Sfameli "Characterization of a three-spot lens for an optical fiber multiple connection", Proc. SPIE 2774, Design and Engineering of Optical Systems, (23 August 1996);

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