Yb
3þ
absorption spectra measured for power launched through the MM inner-clad
pump region (insert in the figure) and the laser-slope efficiency. The fiber has a
30-mm/350-mm core/inner-clad ratio, and the doped core has 1.2 wt% Yb
2
O
3
.
The Yb peak absorption of about 8 dB/m at 976 nm, is the highest to date, to our
knowledge, with an uncompromised Yb
3 þ
laser slope-efficiency of 82%.
15.5.4 High-Performance Yb-Doped Double-Clad Fibers
Introduction
In this section, we give an example of using the above-described “vapor-doping
OVD” process to the development of a high-performance Yb-doped double-clad
fiber, which mitigates detrimental nonlinear SBS. As fiber laser technology con-
tinues to progress with higher power output into the kilowatt range and ...