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Optica Publishing Group
  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper PDA_6

Diffraction-limited operation from a multimode LMA fiber using active digital holography precompensation

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Abstract

We demonstrate for the first time beam pre-compensation shaping using digital holography allowing diffraction-limited operation out of a multimode fiber in CW and pulsed regime. Usually, coherent combining uses several separated single mode fibers to overcome the limitations of fiber lasers and amplifiers caused by nonlinear effects. These techniques imply the use of electronic feedback loops or iterative algorithms to correct the phase, which slows down the active phase correction. Recently, an interesting coherent combining solution based on digital holography has been proposed and demonstrated with three passive single mode fibers [1]. Here, we report on the active wavefront control of a multimode fiber (MMF) beam using the digital holography principle. Coherent combining of the spatial modes of a MMF seems an interesting alternative to separated emitters because of reduced relative thermal drifts, simpler and integrated architecture and the possibility to use standard MMF. Our technique allows the use of very large mode area fiber amplifiers without the need of beam cleanup at the output, while retaining a good spatial beam quality.

© 2009 IEEE

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