Graphene filament-chitin bio-composite polymer based passive Q-switcher in EDFL with tunable wavelength

• Main Authors: Zuikafly, Siti Nur Fatin, Ahmad, Harith, Shafie, Suhaidi, Wan Nawawi, Wan Mohd. Fazli, Ibrahim, Mohd. Haniff, Ahmad, Fauzan
• Format: Conference or Workshop Item
• Published: 2022
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/100381/; http://dx.doi.org/10.1063/5.0083739
• Institution: Universiti Teknologi Malaysia

The generation of pulsed fiber laser and its wavelength tunability using graphene based three-dimensional (3D) printer filament embedded in chitin bio-polymer as passive saturable absorber (SA) in the 1.5 um region was successfully demonstrated. The SA was prepared by extruding the graphene filament through a 3D printer nozzle before mixing it with tetrahydrofuran (THF) in order to dissolve the plastic component. The graphene in THF suspension was then mixed with chitin nanofiber (ChNF) through sonication. The film was formed as the mixture was let dry for 36 hours. The self-started Q-switching operation was kept stable within the input pump power of 9.07 mW to 69.47 mW, with maximum repetition rate and pulse duration of 111.05 kHz and 1.11 us, respectively. By introducing a tunable bandpass filter (TBF) into the cavity, the Q-switched lasing started at 13.60 mW with operating wavelength tunable from 1510 nm to 1564 nm, covering a wavelength range of approximately 54 nm.