Abstract
We report on fundamental mode content measurements performed
on single-frequency large mode area fiber amplifiers based on Er:Yb-codoped
multifilament-core (MFC) and step-index pedestal-design fibers. The mode
content of the amplifier output was analyzed with respect to free-space TEM
modes using a nonconfocal scanning ring cavity. At power levels of several
watts, the commercial step-index pedestal-design fibers with respective core
diameters of 23 and 25 μm showed a TEM<sub>00</sub> mode content exceeding 80%. However, a TEM<sub>00</sub> mode content of up to 95% could be obtained with an MFC fiber
also with larger core diameter of 31/28 μm in hexagonal shape. To the best of our knowledge, we utilized
the nonconfocal scanning ring cavity technique for the first time in the
wavelength region of 1.5 μm and additionally for the first time on fibers with pedestal as
well as MFC design.
© 2010 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription