31 December 2003 Phase diffractive filter to analyze an output step-index fiber beam
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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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