Uncovering the physical origin of self-phasing in coupled fiber lasers

Hung Sheng Chiang, James R. Leger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We studied coherent beam combining in a specific laser cavity architecture in which two Ytterbium-doped fiber amplifiers are passively coupled using a homemade binary phase Dammann grating. Our experimental results show that coherent beam combining is robust against phase perturbation in such a laser cavity architecture when the operating point is sufficiently above the lasing threshold. We observed redistribution of energy within the supermode of this laser cavity in response to an externally applied path length error. The energy redistribution is accompanied by an internal differential phase shift between the coherently coupled gain arms. Self-phasing mitigates or even completely neutralizes the externally applied optical path length error. We identify the physical origin of the observed self-phasing with the resonant (gain related) nonlinearity in the gain elements under our experimental conditions.

Original languageEnglish (US)
Title of host publicationLaser Resonators, Microresonators, and Beam Control XVII
EditorsAlan H. Paxton, Vladimir S. Ilchenko, Kunihiko Washio, Alexis V. Kudryashov, Lutz Aschke
ISBN (Electronic)9781628414332
StatePublished - 2015
EventLaser Resonators, Microresonators, and Beam Control XVII - San Francisco, United States
Duration: Feb 9 2015Feb 12 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceLaser Resonators, Microresonators, and Beam Control XVII
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© 2015 SPIE CCC.


  • Binary phase Dammann grating
  • Coherent beam combining
  • Resonant nonlinearity
  • Self-phasing
  • Ytterbium-doped fiber amplifier


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