Space-time adaptive control of femtosecond pulses amplified in a multimode fiber.

  title={Space-time adaptive control of femtosecond pulses amplified in a multimode fiber.},
  author={Raphael Florentin and Vincent Kermene and Agn{\'e}s Desfarges-Berthelemot and Alain Barth{\'e}l{\'e}my},
  journal={Optics express},
  volume={26 8},
Ultrashort light pulse transport and amplification in a 1.3 m long step-index multimode fiber with gain and with weak coupling has been investigated. An adaptive shaping of the input wavefront, only based on the output intensity pattern, has led to an amplified pulse focused both in space (1/32) and in time (1/10) despite a strong modal group delay dispersion. Optimization of the input owing to the two-photon detection of the amplified signal permitted to excite the fastest and more intense… 

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