We have experimentally reported aluminum zinc oxide (AZO) as a novel saturable absorber to generate a mode-locked laser operating in dark pulsed regime. The D-shaped fiber was first prepared by side polishing a single-mode fiber to the 1 dB insertion loss. The AZO was dissolved in isopropyl alcohol and then deposited onto the D-shaped fiber by drop casting method. By carefully optimizing the polarization of the cavity, a dark pulse was achieved, which remained stable within the pump power of 65.7–101.35 mW. Pulse width was 220 ns, and the pulse repetition rate was 1.85 MHz.

Original languageEnglish
Pages (from-to)322-334
Number of pages13
JournalFiber and Integrated Optics
Issue number4-6
Publication statusPublished - 2021


  • Erbium-doped fiber laser
  • fiber optics
  • ultrafast optics


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