Over the past two decades, fiber laser technologies have matured to such an extent that they
have captured a large portion of the commercial laser marketplace. Yet, there still is a …

We report on photodarkening (PD) investigations at Yb doped fibers with specific variation of
the concentrations of the codopants aluminum and phosphorus, measured during cladding …

The fiber laser, with its humble beginning in the late 1980s, has undergone tremendous
development in the past decade or so, transforming itself from a research curiosity to a major …

We have demonstrated a highly efficient cladding-pumped ytterbium-doped fiber laser,
generating> 2.1 kW of continuous-wave output power at 1.1 μm with 74% slope efficiency …

We report a novel type of active fiber–tapered double clad fiber suitable for pumping by low
brightness sources with large beam parameter product of 50÷ 300 mm× mrad. Ytterbium …

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 …

Photodarkening in Yb doped fibers was examined at 633 nm in-situ during cladding
pumping at 915 nm with varying pump powers and with no indication of an onset threshold …

Photodarkening experiments are performed on ytterbium-doped silicate glass samples. A
strong charge-transfer (CT) absorption band near 230nm in aluminosilicate glass is found to …

A broad visible luminescence band and characteristic IR luminescence of Yb^ 3+ ions are
observed under UV excitation in ytterbium-doped aluminosilicate glass. Samples made …

Using a combination of pulse electron paramagnetic resonance and photoluminescence
spectroscopy, we demonstrate the major role of phosphorous rather than aluminium in the …