Q-switched thulium-doped fibre laser operating at 1900 nm using multi-walled carbon nanotubes saturable absorber

The Journal of Engineering

Kaharudin Dimyati¹  Anas A. Latiff²  Sulaiman W. Harun³  Fauzan Ahmad³  Dess I.M. Zen³  Norazlina Saidin³  Harith Ahmad³  Muhammad T. Ahmad³  Hazlihan Haris³ 

[1] Department of Electrical and Electronic Engineering, National Defense University of Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia;Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, 76100 Durian Tunggal, Melaka, Malaysia;Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia

关键词: dilute polyvinyl alcohol polymer solution;    thin hlm;    optimisation;    laser cavity;    multiwalled carbon nanotubes saturable absorber;    room temperature;    MWCNT;    wavelength 802 nm to 1910.8 nm;    pump power;    time 18.3 mus;    C;    power 187.3 mW to 382.1 mW;    Q-switched thulium-doped fibre laser;    stable passive TDFL;    pulse repetition rate;    Q-switching pulse generation;    FC-PC fibre connectors;    time 22.1 mus;   

DOI  :  10.1049/joe.2014.0038

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Simple, low-cost and stable passive Q-switched thulium-doped fibre lasers (TDFLs) operating at 1892.4 and 1910.8 nm are demonstrated using 802 and 1552 nm pumping schemes, respectively, in conjunction with a multi-walled carbon nanotubes (MWCNTs) saturable absorber (SA). The MWCNTs composite is prepared by mixing the MWCNTs homogeneous solution into a dilute polyvinyl alcohol (PVA) polymer solution before it is left to dry at room temperature to produce thin film. Then the film is sandwiched between two FC/PC fibre connectors and integrated into the laser cavity for Q-switching pulse generation. The pulse repetition rate of the TDFL configured with 802 nm pump can be tuned from 3.8 to 4.6 kHz, whereas the corresponding pulse width reduces from 22.1 to 18.3 μs as the pump power is increased from 187.3 to 194.2 mW. On the other hand, with 1552 nm pumping, the TDFL generates optical pulse train with a repetition rate ranging from 13.1 to 21.7 kHz with a pulse width of 11.5–7.9 μs when the pump power is tuned from 302.2 to 382.1 mW. A higher performance Q-switched TDFL is expected to be achieved with the optimisation of the MWCNT-SA saturable absorber and laser cavity.

【 授权许可】

CC BY