31 December 2003 Phase diffractive filter to analyze an output step-index fiber beam
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Abstract
A multi-order phase-only binary diffractive optical element was designed and fabricated to generate simultaneously in different diffractive orders 32 (doubled) LP-modes with indices n=0,11, m=1,5. The modes can propagate in a step-index optical fiber with cutoff value V=15. The same DOE can be used to launch LP-modes into a weakly guiding optical fiber and to select (detect) such modes at the fiber output. In the second case, the DOE works as a spatial filter matched to a definite set of modes. Several bounded modes can be excited in a step-index fiber that is single-mode bounded at wavelength 1300 nm using a laser beam at wavelength 632.8 nm (for which the DOE is fabricated). The experimental results of analyzing a multi-mode beam at the fiber output using the designed filter are reported.
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Svetlana N. Khonina, Svetlana N. Khonina, Roman V. Skidanov, Roman V. Skidanov, Victor V. Kotlyar, Victor V. Kotlyar, Konstantins Jefimovs, Konstantins Jefimovs, Jari Turunen, Jari Turunen, } "Phase diffractive filter to analyze an output step-index fiber beam", Proc. SPIE 5182, Wave-Optical Systems Engineering II, (31 December 2003); doi: 10.1117/12.509468; https://doi.org/10.1117/12.509468
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