Title :
Q-switched thulium-doped fibre laser operating at 1900 nm using multi-layered graphene based saturable absorber
Author :
Saidin, N. ; Zen, D.I.M. ; Ahmad, Farhan ; Damanhuri, S.S.A. ; Ahmad, Harith ; Dimyati, Kaharudin ; Harun, Sulaiman Wadi
Author_Institution :
Photonics Res. Centre, Univ. of Malaya, Kuala Lumpur, Malaysia
Abstract :
A stable passive Q-switched thulium-doped fibre laser (TDFL) operating at the 1900 nm region is demonstrated by using a multi-layer graphene film-based saturable absorber (SA). The graphene is synthesised by electrochemical exfoliation of graphite at room temperature in 1% sodium dodecyl sulphate aqueous solution. Graphene flakes obtained from the process are mixed with polyethylene oxide as the host polymer to produce free standing composite thin film which acts as a passive Q-switcher in the TDFL ring cavity. At 793 nm pump power of 186 mW, the TDFL generates an optical pulse train with a repetition rate of 7.5 kHz, pulse width of 19.7 μs and a pulse energy of 66.6 nJ. A higher performance Q-switched TDFL could be achieved with the optimisation of the graphene SA and the laser cavity.
Keywords :
Q-switching; electrochemistry; fibre lasers; graphene; laser beams; laser cavity resonators; optical multilayers; optical polymers; optical pulse generation; optical pumping; optical saturable absorption; ring lasers; thin films; thulium; TDFL ring cavity; electrochemical exfoliation; energy 66.6 nJ; free standing composite thin film; frequency 7.5 kHz; graphene flakes; host polymer; laser cavity; multilayer graphene film-based saturable absorber; optical pulse train; optimisation; polyethylene oxide; power 186 mW; pulse energy; pulse width; pump power; repetition rate; sodium dodecyl sulphate aqueous solution; stable passive Q-switched thulium-doped fibre laser; wavelength 1900 nm; wavelength 793 nm;
Journal_Title :
Optoelectronics, IET
DOI :
10.1049/iet-opt.2013.0054