Passive Coherent Laser Beam Combining with Spatial Mode Selecting Feedback

W. Minster Kunkel, James R. Leger

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A general N-by-N coupling matrix that provides lossless uniform feedback to all laser array elements is demonstrated in the analysis of a passive coherent beam combining resonator. The resonator contains a spatial filter that sends rejected optical power from the combining optic back into the cavity. This recycling of otherwise unused power yields an increase in the average laser output power that scales with array size N, even in the absence of passive phase effects that depend on the gain, intensity, and wavelength of the laser mode. To achieve this improvement, tailored path lengths and mirror reflectivities are required in the feedback arms, where the phase may be fixed, whereas in the gain arms, the path lengths vary randomly.

Original languageEnglish (US)
Article number8747414
JournalIEEE Journal of Quantum Electronics
Issue number4
StatePublished - Aug 2019



  • Coherent beam combining
  • optical arrays
  • optical fiber lasers
  • optical resonators

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