Open AccessReconversion of higher-order-mode (HOM) output from cladding-pumped hybrid Yb:HOM fiber amplifier
Author(s) -
Kazi S. Abedin,
Raja Ahmad,
A. DeSantolo,
D. J. DiGiovanni
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.008585
Subject(s) - optics , axicon , amplifier , materials science , laser beam quality , multi mode optical fiber , ytterbium , cladding (metalworking) , optical amplifier , amplified spontaneous emission , physics , optoelectronics , optical fiber , laser , laser beams , cmos , metallurgy
We demonstrate operation of a cladding-pumped hybrid ytterbium-doped HOM fiber amplifier and reconversion of the HOM output to Gaussian-like beam by using an axicon based reconversion system. The amplifier was constructed by concatenating single-mode and HOM ytterbium-doped double clad fibers, and was excited by a common multimode pump source. A continuous wave (cw) input signal of 97mW was amplified to 100W at the amplifier output, which yielded a gain of more than 30dB. The LP 0,10 output of the HOM amplifier could be converted to a Gaussian-like beam with 67% conversion efficiency. We present, both analytically and numerically, the effects of scaling the beam size on axicon's apex angle, and how shape imperfections affect the mode converter's performance.