Analysis and experimental demonstration of spatial mode selection in a coherently combined fiber laser

Erik Tilseth, W. Minster Kunkel, James R. Leger

Research output: Contribution to journalArticlepeer-review

Abstract

Self-phasing due to spatial mode selection in a two-element passively coupled fiber laser is studied. We find that the addition of a second supermode in a coupled resonator results in a 90% increase in the average output power and nearly π/2 radians of passive phase adjustment versus applied phase errors between the gain elements. These results require a phase of zero (modulo 2π) between the beams in the external cavity. These findings are supported by an eigenmode analysis of the resonator and show that beam recycling is a useful resonator design feature but must be appropriately implemented to obtain beneficial results.

Original languageEnglish (US)
Pages (from-to)1854-1867
Number of pages14
JournalOptics Express
Volume28
Issue number2
DOIs
StatePublished - Jan 20 2020

Bibliographical note

Funding Information:
Air Force Office of Scientific Research (FA9550-14-1-0382 P00001).

Publisher Copyright:
© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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