Spatial self-imaging, consisting of the periodic replication of the optical transverse beam profile along the propagation direction, can be achieved in guided wave systems when all excited modes interfere in phase. We exploited material defects photoluminescence for directly visualizing self-imaging in a few-mode, nominal singlemode SMF-28 optical fiber. Visible luminescence was excited by intense femtosecond infrared pulses via multiphoton absorption processes. Our method permits us to determine the mode propagation constants and the cutoff wavelength of transverse fiber modes.
Experimental observation of self-imaging in SMF-28 optical fibers / Mangini, F.; Ferraro, M.; Zitelli, M.; Niang, A.; Tonello, A.; Couderc, V.; Sidelnikov, O.; Frezza, F.; Wabnitz, S.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 29:8(2021), pp. 1-9. [10.1364/OE.419472]
Experimental observation of self-imaging in SMF-28 optical fibers
Mangini, F.;Ferraro, M.;Zitelli, M.;Frezza, F.;Wabnitz, S.
2021
Abstract
Spatial self-imaging, consisting of the periodic replication of the optical transverse beam profile along the propagation direction, can be achieved in guided wave systems when all excited modes interfere in phase. We exploited material defects photoluminescence for directly visualizing self-imaging in a few-mode, nominal singlemode SMF-28 optical fiber. Visible luminescence was excited by intense femtosecond infrared pulses via multiphoton absorption processes. Our method permits us to determine the mode propagation constants and the cutoff wavelength of transverse fiber modes.| File | Dimensione | Formato | |
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