A model based on propagation-rate equations with consideration of transverse gain
distribution is built up to describe the transverse mode competition in strongly pumped …

This paper introduces a simple, analytical method for generalizing the behavior of bent,
weakly-guided fibers and waveguides. It begins with a comprehensive study of the modes of …

Gain filtering of higher order modes in large-mode-area fibers is an extremely robust method
for providing diffraction-limited performance regardless of core diameter or input beam …

This paper outlines the most recent work at nLIGHT Oy (formerly Liekki Oy). We give an
overview of the current state of the nLIGHT active fiber fabrication technology, discuss the …

By confining the Yb doping within a smaller radius in the center of the core of the few-mode
large-mode-area fiber, the fundamental mode, which overlaps better with the Yb ions, sees …

We propose and demonstrate a new type of Yb-doped fiber called spindle-shaped core
ytterbium-doped fiber (SSCYDF) and conduct a laser oscillator based on this fiber. The …

We present an experimental and theoretical analysis of four-wave mixing in nanosecond
pulsed amplifiers based on double-clad ytterbium-doped fibers. This process leads to …

We present a theoretical study of four-wave mixing interactions in fibers in the presence of
gain. In contrast to passive fibers, positive gain at the pump wavelength leads to constructive …

摘要从无源光纤的模场理论和有源光纤的速率方程理论出发, 给出了任意折射率分布和掺杂分布
光纤的有效模面积和基模提取效率的计算方法, 并且通过数值计算对几种典型折射率分布和掺杂 …

Novel transverse techniques for measuring the refractive index profile and spontaneous
emission of high-power optical fibers are described. These techniques are particularly …