Q-switching and mode-locking pulse generation with graphene oxide paper-based saturable absorber

The Journal of Engineering

Salam Mahdi Azooz¹  Mohd Afiq Ismail¹  Ahmad Zarif Zulkifli¹  Sulaiman Wadi Harun²  Harith Ahmad²  Muhamad Burhan Shah Sabran² 

[1] Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia

关键词: 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;   

DOI  :  10.1049/joe.2014.0321

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

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.

【 授权许可】

CC BY