Abstract
We report a single-end forward-pumped fiber laser with a record high
output power of 3 kW. The laser is assembled exclusively from
commercially widespread components such as the Yb-doped fiber with
core/cladding diameter of 20/400 µm, pump laser diodes at an
emission wavelength of 915 nm, and a signal and pump fiber
combiner that serves as the pump recycler. The record high power
arises from the combination of the 915 nm pumping and pump
recycler with an effective reflectivity of 78%, increasing
simultaneously the thresholds for stimulated Raman scattering and
transverse mode instability (TMI). The length of the oscillator was
also varied experimentally from 20 m to 5 m, showing a
contrast of up to 19% in the TMI threshold. This shows the importance
of accurately partitioning the Yb-doped fiber length in between the
oscillator and amplifier sections to minimize the impact of TMI.
Funder
Natural Sciences and Engineering Research
Council of Canada
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering