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@inproceedings{Geberbauer:2023:10.1117/12.2650889,
author = {Geberbauer, JWT and Murray, RT and Runcorn, TH and Kerridge-Johns, WR},
doi = {10.1117/12.2650889},
title = {Yb fiber vortex laser using an interferometric mode converting output coupler},
url = {http://dx.doi.org/10.1117/12.2650889},
year = {2023}
}
TY - CPAPER
AB - We apply mode transformation to an Yb fiber laser for direct generation of a first order vortex mode (LG01), yielding LG01 power of 5 W at 96 % purity (from modal decomposition) with 16 W pumping. The laser used standard single mode Yb doped fibers operating at 1064 nm. A free-space Sagnac interferometer formed one reflector of the cavity by feeding back the internal Gaussian mode of the fiber laser and output coupling a LG01 via interferometric mode transformation. It was stable over hours of operation and days of inactivity, and was insensitive to polarisation. The maximum output power was only limited through heating of a optical element, which could be mitigated with thermal management. We also show that additional spiral phase plates (SPPs) are a route to higher purity, higher order vortex modes than with SPPs alone due to improved intensity matching between LG01 and higher order states.
AU - Geberbauer,JWT
AU - Murray,RT
AU - Runcorn,TH
AU - Kerridge-Johns,WR
DO - 10.1117/12.2650889
PY - 2023///
SN - 0277-786X
TI - Yb fiber vortex laser using an interferometric mode converting output coupler
UR - http://dx.doi.org/10.1117/12.2650889
ER -