TiO2-SiO2 nanocomposite saturable absorber for ultrafast photonics

A tapered microfiber decorated with titanium dioxide-silicon dioxide nanocomposite saturable absorber (TiO 2 -SiO 2 -SA) is demonstrated via alkali fusion method and spin-coating technique. The TiO 2 -SiO 2 -SA exhibited 17.1% modulation depth, 31.7 μJ/cm 2 saturation fluence and 35.4% non-saturable...

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Bibliographic Details
Published in:IEEE photonics journal 2023-01, Vol.15 (1), p.1-10
Main Authors: Yusoff, Norita Mohd, Ng, Eng Khoon, Rosli, Natrah Shafiqah, Abdullah, Che Azurahanim Che, Md. Yusoff, Nelydia, Mahdi, Mohd Adzir
Format: Article
Language:English
Subjects:
Absorbers
Absorption
Erbium-doped fiber laser
Fluence
Microfibers
Mode-locked
Nanocomposites
Nanomaterials
Nanoparticles
Optical fibers
Photonics
Pulse duration
saturable absorber
Silicon compounds
Silicon dioxide
Spin coating
Titanium
Titanium dioxide
X-ray scattering
Yield point
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Summary:A tapered microfiber decorated with titanium dioxide-silicon dioxide nanocomposite saturable absorber (TiO 2 -SiO 2 -SA) is demonstrated via alkali fusion method and spin-coating technique. The TiO 2 -SiO 2 -SA exhibited 17.1% modulation depth, 31.7 μJ/cm 2 saturation fluence and 35.4% non-saturable loss. The TiO 2 -SiO 2 -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/cm 2 and excellent stability are believed to have opened a new route of using nanomaterials derived from waste product for next generation ultrafast photonic applications.
ISSN:1943-0647
DOI:10.1109/JPHOT.2023.3237513