Phase locking in a multicore fiber laser by means of a Talbot resonator

Abstract

We report phase locking of a diode-pumped multicore fiber laser with a circular array of 18 Nd-doped emitters (microcores) acting as an active medium. Phase locking was achieved in a Talbot resonator configuration. We present calculations of the effective reflection coefficients that are due to self-imaging. Far-field distributions and near-field pattern of several supermodes are calculated and compared with experimental results.

Coherent combining of fibre lasers

“…The composite fibre is usually made-up of several amplifying cores either electromagnetically coupled or not [22][23][24][25][26]. Whatever the case considered, most of the time, an external device is necessary to phase-lock all the elementary emitters.…”

“…Desfarges-Berthelemot et al / C. R. Physique 7 (2006) [244][245][246][247][248][249][250][251][252][253] Jusqu'à présent, dans ce type de structure, l'émission était répartie sur un supermode de forte divergence comparée au mode fondamental gaussien [22][23][24][25][26].…”

Fiber laser based on 4-core Yb-doped fiber and multimode Bragg grating

“…The main problem of the coherent combining consists in the phase locking realization. Phase locking of 18 cores by means of Talbot resonator was demonstrated Figure 1 The simplified laser scheme in [4]. Disadvantage of this work consists in the bulk element application.…”

Coherent combining in an air clad Yb doped dual concentric core fiber laser

“…The high spatiotemporal confinement of the signal wave is incompatible with power scaling because of the non linear effects which can dramatically decrease the spatial and spectral qualities of the laser beam. To increase doped area while maintaining single mode operation of these lasers, several solutions have already been investigated, such as Large Mode Area (LMA) fiber lasers [1,2] or multicore fiber lasers [3][4][5]. In these innovating architectures, the large overlap between doped cores and pump radiation enhances very efficient pump absorption allowing use of shorter fibers.…”