18 October 2016 High-power Q-switched erbium-ytterbium codoped fiber laser using multiwalled carbon nanotubes saturable absorber
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Abstract
Due to an enormous potential of pulsed lasers in applications such as manufacturing, metrology, environmental sensing, and biomedical diagnostics, a high-power and stable Q-switched erbium-ytterbium codoped double-clad fiber laser (EYDFL) incorporating of multiwall carbon nanotubes (MWCNTs) saturable absorber (SA) made based on polyvinyl alcohol (PVA) with a 3∶2 ratio is demonstrated. The SA was fabricated by mixing a dilute PVA solution with an MWCNTs homogeneous solution. Subsequently, the mixture was sonicated and centrifuged to produce a homogeneous suspension that was left to dry at room temperature to form the MWCNTs-PVA film. The SA was formed by inserting the film between a pair of FC/PC fiber connectors. Then, it was integrated into the EYDFL’s ring cavity, which uses a 5-m-long erbium-ytterbium codoped fiber (EYDF). The lasing threshold for the Q-switched EYDFL was at 330 mW. At the maximum available pump power of 900 mW, the proposed EYDFL produced Q-switched pulses with a repetition rate of 74.85 kHz, pulsewidth of ∼3.6  μs, and an average output power of about 5 mW. The maximum energy per pulse of ∼85  nJ was obtained at pump power of ∼700  mW with peak power of 21 mW.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Mohd Zulhakimi Ab Razak, Zatul Saliza Saleh, Fauzan Ahmad, Caroline Livan Anyi, Sulaiman Wadi Harun, Hamzah bin Arof, "High-power Q-switched erbium-ytterbium codoped fiber laser using multiwalled carbon nanotubes saturable absorber," Optical Engineering 55(10), 106112 (18 October 2016). https://doi.org/10.1117/1.OE.55.10.106112 . Submission:
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