Q-switching and mode-locking pulse generation with graphene oxide paper-based saturable absorber
- Author(s): Sulaiman Wadi Harun 1, 2 ; Muhamad Burhan Shah Sabran 1 ; Salam Mahdi Azooz 2 ; Ahmad Zarif Zulkifli 2 ; Mohd Afiq Ismail 2 ; Harith Ahmad 1
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View affiliations
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Affiliations:
1:
Photonics Research Centre , University of Malaya , 50603 Kuala Lumpur , Malaysia ;
2: Department of Electrical Engineering , Faculty of Engineering , University of Malaya , 50603 Kuala Lumpur , Malaysia
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Affiliations:
1:
Photonics Research Centre , University of Malaya , 50603 Kuala Lumpur , Malaysia ;
- Source:
Volume 2015, Issue 6,
June
2015,
p.
208 – 214
DOI: 10.1049/joe.2014.0321 , Online ISSN 2051-3305
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Q-switched and mode-locked erbium-doped fibre lasers (EDFLs) are demonstrated by using non-conductive graphene oxide (GO) paper as a saturable absorber (SA). A stable and self-starting Q-switched operation was achieved at 1534.4 nm by using a 0.8 m long erbium-doped fibre (EDF) as a gain medium. The pulse repetition rate changed from 14.3 to 31.5 kHz, whereas the corresponding pulse width decreased from 32.8 to 13.8 µs as the pump power increased from 22 to 50.5 mW. A narrow spacing dual-wavelength Q-switched EDFL could also be realised by including a photonics crystal fibre and a tunable Bragg filter in the setup. It can operate at a maximum repetition rate of 31 kHz, with a pulse duration of 7.04 µs and pulse energy of 2.8 nJ. Another GOSA was used to realise mode-locked EDFL in a different cavity consisting of a 1.6 m long EDF in conjunction with 1480 nm pumping. The laser generated a soliton pulse train with a repetition rate of 15.62 MHz and pulse width of 870 fs. It is observed that the proposed fibre lasers have a low pulsing threshold pump power as well as a low damage threshold.
Inspec keywords: Bragg gratings; Q-switching; optical pumping; optical filters; laser mode locking; photonic crystals; optical solitons; fibre lasers; graphene; holey fibres; erbium; paper; optical tuning; optical pulse generation; laser cavity resonators; optical saturable absorption
Other keywords: pulse repetition rate; wavelength 1534.4 nm to 1480 nm; soliton pulse train; threshold pump power; CO; tunable Bragg filter; energy 2.8 nJ; Q-switching; gain medium; erbium-doped fibre lasers; self-starting Q-switched operation; power 22 mW to 50.5 mW; mode-locking pulse generation; frequency 14.3 kHz to 31.5 kHz; distance 0.8 m to 1.6 m; cavity; pump power; saturable absorber; low damage threshold; photonics crystal fibre; nonconductive graphene oxide paper
Subjects: Laser beam modulation, pulsing and switching; mode locking and tuning; Laser resonators and cavities; Optical solitons; Gratings, echelles; Photonic bandgap materials; Optical saturation and related effects; Ultrafast optical techniques; Optical transient phenomena, self-induced transparency, optical saturation and related effects; Laser beam modulation, pulsing and switching; mode locking and tuning; Design of specific laser systems; Optical solitons; Fibre lasers and amplifiers; Optical coatings and filters; Fibre lasers and amplifiers; Spectral and other filters; Laser resonators and cavities
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