In this paper, we summarize the research on photodarkening in optical fibers. The causes of
photodarkening in fiber, the influence of photodarkening on fiber laser, the experimental …

We report the analysis of multimode pump absorption in double-clad rare-earth-doped fibers
under realistic bending conditions. The finite-element beam-propagation method is used for …

We theoretically investigate the quantum defect between pump and signal photons in
ytterbium-doped fiber lasers and amplifiers, and find that this can be as low as 0.6%. We find …

A master oscillator-power amplifier (MOPA) has been fabricated and optimized for
measuring the small-signal gain (γ 0) and saturation power (P sat) of a continuous-wave …

We derive and assess an explicit analytic expression for the power conversion efficiency
(PCE) of high-power continuous-wave optical fiber amplifiers with counter-propagating …

A procedure to extract spectroscopic information from erbium doped fibres (EDF), based on
transient laser behaviour analysis, is presented. It achieves a complete characterisation of …

A complete model for signal and fluorescence amplification in Ti, Er: LiNbO/sub
3/waveguides under 1480 and 980 nm excitation, which includes transitions involving high …

A simple mathematical function is introduced to describe a wide assortment of dopant
profiles and study its influence on an erbium-doped fiber performance. Significant gain …

We report an efficient, high-power operation of a fiber laser and a power amplifier at~ 978
nm incorporating an extra-large-mode-area (XLMA) triple-clad Yb-doped fiber. A simple …

Rate equations based on intensity-dependent overlapping factors are integrated to obtain
analytic solutions for pump, signal, and amplified spontaneous emission (ASE), even when …