Tapered Multicore Fiber for High-Power Laser Amplifiers

Abstract

The problem of coherent amplification of the outof-phase mode in tapered multicore fibers with cores arranged in a ring and in a square lattice is studied theoretically. The stability of out-of-phase field distributions with respect to both inhomogeneities of the refractive index and the initial wave field distribution is demonstrated in numerical modeling. Coherent combining of radiation into a single beam with good quality and efficiency of about 80% for ring cores arrangement and more than 90% for square cores arrangement is possible. Achievement of 55 MW of total power at the output of a fiber with 11 × 11 cores is numerically demonstrated.

Nonlinear pulse dynamic in a weak coupled normal dispersion multicore fiber

“…In recent years, the propagation of laser radiation in multicore fibers (MCF) with weak coupling between the cores has attracted much attention. [1][2][3][4][5][6] Thanks to the use of such fibers, it becomes possible to amplify coherently high-power laser pulses with the maintaining of radiation characteristics, 7,8 and it also becomes possible to combine radiation from different laser sources into one beam with minimal power loss. 9 Powerful ultrashort laser pulses can further be used for material processing, medicine, spectroscopy, etc.…”

Cladding-Pumped Er/Yb-Co-Doped Fiber Amplifier for Multi-Channel Operation

“…However, telecom-related applications have also gained momentum by proving their particular significance in such applications. The multifold of different fiber structures and techniques can be designed to address specific telecom amplifier needs, for instance, a multi-cladding optical fiber with a non-circular symmetry that aims to enhance pump absorption via twisting and coiling [1], the reduction in nonlinear effects with tapered fiber [2], fiber dispersion engineering [3,4]. The simulation of cladding-pumped doped fiber amplifier performance is also of particular interest due to the necessity of obtaining initial estimates of the key performance indicators, such as noise figure (NF) and gain [5].…”