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Continuous and discrete-point Rayleigh reflectors inscribed by femtosecond pulses in singlemode and multimode fibers by Alexandr Dostovalov; Alexey Wolf; Zhibzema Munkueva; Mikhail Skvortsov; Sofia Abdullina; Aleksey Kuznetsov; Sergey Babin is a Engineering article available to read on EtoBox.

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In this paper we present the results on structures inscription to enhance Rayleigh backscattering up to +60 dB in the wide spectral range in singlemode and multimode fibers by tightly focused femtosecond laser radiation. Continuous and discrete-point artificial Rayleigh reflectors were produced and optimized in terms of backscattering enhancement level and insertion losses. The linewidth narrowing of single-frequency DFB Er-doped fiber laser based on the developed 40-cm long artificial Rayleigh reflector in singlemode fiber was demonstrated. Moreover, the various types (1D, 2D, 3D) of localized Rayleigh reflectors were inscribed in the multimode GRIN fiber revealing the strong dependence of backscattering signal on the positions of scattering points in the fiber core cross-section and on the modes composition incident on the reflector. Due to the random distributed feedback based on the developed multimode Rayleigh reflectors, we observed random lasing in 1-km MM GRIN fiber with good (M 2 < 3) beam quality at much lower threshold power than that for lasing based on natural Rayleigh backscattering.

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Author

Alexandr Dostovalov; Alexey Wolf; Zhibzema Munkueva; Mikhail Skvortsov; Sofia Abdullina; Aleksey Kuznetsov; Sergey Babin

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)