IEEE Photonics Journal (Jan 2023)

TiO<sub>2</sub>-SiO<sub>2</sub> Nanocomposite Saturable Absorber for Ultrafast Photonics

  • Norita Mohd Yusoff,
  • Eng Khoon Ng,
  • Natrah Shafiqah Rosli,
  • Che Azurahanim Che Abdullah,
  • Nelydia Md. Yusoff,
  • Mohd Adzir Mahdi

DOI
https://doi.org/10.1109/JPHOT.2023.3237513
Journal volume & issue
Vol. 15, no. 1
pp. 1 – 10

Abstract

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A tapered microfiber decorated with titanium dioxide-silicon dioxide nanocomposite saturable absorber (TiO2-SiO2-SA) is demonstrated via alkali fusion method and spin-coating technique. The TiO2-SiO2-SA exhibited 17.1% modulation depth, 31.7 µJ/cm2 saturation fluence and 35.4% non-saturable loss. The TiO2-SiO2-SA was able to generate a pulse duration of 797 fs at a repetition rate of 10.39 MHz and an average output power of 16.57 mW at 1.56 μm. This work presents an enhanced pulse duration within titanium-based saturable absorbers. The high damage threshold of beyond 24.82 GW/cm2 and excellent stability are believed to have opened a new route of using nanomaterials derived from waste product for next generation ultrafast photonic applications.

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