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Sub-20-Attosecond Timing Jitter Mode-Locked Fiber Lasers

  • Kim, Hyoji
  • Qin, Peng
  • Song, Youjian
  • Yang, Heewon
  • Shin, Junho
  • Kim, Chur
  • Jung, Kwangyun
  • Wang, Chingyue
  • Kim, Jungwon
Published Article
Publication Date
Jan 17, 2014
Submission Date
Jan 02, 2014
DOI: 10.1109/JSTQE.2014.2298454
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We demonstrate 14.3-attosecond timing jitter [integrated from 10 kHz to 94 MHz offset frequency] optical pulse trains from 188-MHz repetition-rate mode-locked Yb-fiber lasers. In order to minimize the timing jitter, we shorten the non-gain fiber length to shorten the pulsewidth and reduce excessive higher-order nonlinearity and nonlinear chirp in the fiber laser. The measured jitter spectrum is limited by the amplified spontaneous emission limited quantum noise in the 100 kHz - 1 MHz offset frequency range, while it was limited by the relative intensity noise-converted jitter in the lower offset frequency range. This intrinsically low timing jitter enables sub-100-attosecond synchronization between the two mode-locked Yb-fiber lasers over the full Nyquist frequency with a modest 10-kHz locking bandwidth. The demonstrated performance is the lowest timing jitter measured from any free-running mode-locked fiber lasers, comparable to the performance of the lowest-jitter Ti:sapphire solid-state lasers.

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