100 watt single-mode CW linearly polarized all-fiber format 1.56-μm laser with suppression of parasitic lasing effects

Erbium:Ytterbium Codoped Large-Core Fiber Laser With 297-W Continuous-Wave Output Power

“…One might think that configurations with, for example, a bandrejection filter for Yb emission inside the cavity [12] or angle-cleaved fiber ends combined with external feedback mirrors reflecting only at ~ 1.6 µm would help in reducing spurious Yb emission. However this is only correct to a limited degree.…”

Yb band parasitic lasing suppression in Er/Yb-co-doped pulsed fiber amplifier based on all-solid photonic bandgap fiber

“…ions in purely Er-doped fiber [1] and the Yb amplified spontaneous emission (Yb-ASE) in Er/Yb-co-doped fiber [2]. Moreover, in the Er/Yb-co-doped fiber systems, the parasitic lasing and self-pulsing effects will occur inside of the fiber with the increase in pump power, which can easily damage the system [3].…”

“…In Ref. [3] two fiber Bragg gratings (FBG) and a specially designed wide-band filter were utilized to filter out the Yb-ASE, this solution being effective but at the same time-costly and time-consuming for tailor-made FBGs. Another approach was using the counter-propagating pumping scheme [4], but the Yb-ASE can still appear under high-power operation.…”

Robustly Single-mode Polarization Maintaining Er/Yb co-doped LMA Fiber for High Power Applications

“…al. [5] employed a 20μm core fiber, which supports 30 modes, to achieve 100W output with a near diffraction-limited beam by employing single-mode fiber based components in the cavity and making highly precise splices between the single-mode fibers and the multi-mode active fiber. Although a high-power near diffractionlimited output was achieved, such methods are cumbersome and further emphasize the need for LMA fibers.…”