A stable mode-locked laser was demonstrated using a newly developed zinc phthalocyanine (ZnPc) thin film as passive saturable absorber (SA) in ytterbium-doped fiber laser (YDFL). The ZnPc thin film was obtained using a casting method and then inserted between the two fiber ferrules of a YDFL ring cavity to generate mode-locked pulses. The resulting pulsed laser operated at a wavelength of 1034.5 nm having a repetition rate of 3.3 MHz. At pump power of 277 mW, the maximum output power and pulse energy are achieved at 4.92 mW and 1.36 nJ, respectively. ZnPc has a high chemical and photochemical stability, and its significance for use as a potential SA in a mode-locked laser is reported in this work. Graphical Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Article number28
JournalFrontiers of Optoelectronics
Issue number1
Publication statusPublished - Dec 2022


  • Mode-locking
  • Saturable absorber (SA)
  • Ytterbium-doped fiber laser (YDFL)
  • Zinc phthalocyanine (ZnPc) thin film


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