Reconstruction of field distributions of an active multicore fiber in multimode fibers

Marc Wrage; Peter Glas; M. Leitner; Thomas Sandrock; Nickolai N. Elkin; Anatoly P. Napartovich; Dmitri V. Vysotsky

doi:10.1117/12.385405

12 May 2000 Reconstruction of field distributions of an active multicore fiber in multimode fibers

Marc Wrage, Peter Glas, M. Leitner, Thomas Sandrock, Nickolai N. Elkin, Anatoly P. Napartovich, Dmitri V. Vysotsky

Proceedings Volume 3930, Laser Resonators III; (2000) https://doi.org/10.1117/12.385405
Event: Symposium on High-Power Lasers and Applications, 2000, San Jose, CA, United States

Abstract

Multimode interference is fairly known from the 1D case of slab waveguides. We present for the first time to our knowledge the reconstruction of the 2D radial symmetric structure of a multicore fiber laser in a multimode fiber. In the concept of multicore fiber, rare earth-doped single mode waveguides (micro cores) are placed on a ring inside a big pump core. The situation of injecting radiation from N incoherent emitting sources into a multimode waveguide is described analytically. Experimental and numerical results for various multimode diameters and fiber lengths dealing with the reconstruction of the injected near-field pattern and the corresponding far-field patterns are presented. We propose that the reconstructed field could be re-injected into the multicore fiber-laser in order to introduce parallel coupling of all emitters. Additionally, using the multimode fiber as a passive element, without re-injection, the on-axis intensity of the multicore laser radiation is significantly increased by a single pass through a multimode fiber with a certain length. This effect takes place without any loss of energy.

Citation Download Citation

Marc Wrage, Peter Glas, M. Leitner, Thomas Sandrock, Nickolai N. Elkin, Anatoly P. Napartovich, and Dmitri V. Vysotsky "Reconstruction of field distributions of an active multicore fiber in multimode fibers", Proc. SPIE 3930, Laser Resonators III, (12 May 2000); https://doi.org/10.1117/12.385405

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