Harmonic mode-locking in a Tm-doped fiber laser: Characterization of its timing jitter and ultralong starting dynamics

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• 作者：Chengying Bao ; Changxi Yang ; ^{cxyang@tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Harmonic mode-locking ; Tm-doped fiber laser ; Timing jitter
• 刊名：Optics Communications
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：356
• 期：Complete
• 页码：463-467
• 全文大小：1083 K

文摘

We report an experimental characterization on harmonic mode-locking in a Tm-doped fiber laser, which exhibits pump related timing jitter and ultralong mode-locking starting dynamics. The laser is pumped by a laser diode seeded EDFA. Harmonic mode-locking is initiated by nonlinear polarization rotation and showed a good long term stability. Timing jitter is found to be significantly influenced by the properties of laser diode seed for the EDFA. When switching the seed from a Fabry–Perot cavity laser diode to a distributed feedback (DFB) laser diode, timing jitter decreases from 16 ps to 6 ps. It also takes the laser an ultralong self-starting time $(>100\mathrm{s})$, 3 order of magnitude longer than typical Er-doped or Yb-doped fiber lasers, to reach a steady harmonic mode-locking in some cases. These experimental evidences can contribute to a better understanding of Tm-doped fiber lasers.