Harmonic Mode-Locked Ytterbium-Doped Fibre Ring Laser

  • Received Date: October 18, 2006
  • Published Date: March 31, 2007
  • We demonstrate a harmonic mode-locked ytterbium-doped fibre ring laser,
    which consists of a polarization-sensitive isolator, two polarization controllers, two 976nm laser diodes as the pump source and a two-segment ytterbium-doped fibre. Utilizing an additive pulse mode-locked technique based on nonlinear polarization evolution, the ytterbium-doped fibre laser can operate in mode-locked state by adjusting the position of polarization controllers. The cavity fundamental repetition rate is 23.78MHz. We also observe the second-
    and third-harmonic mode locking in the normal dispersion region, and their repetition rates are 47.66MHz and 71.56MHz, respectively. Over-driving of the saturable absorber in the harmonic mode-locking pulse is analysed and discussed in detail.
  • Article Text

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