Demonstration of passive saturable absorber by utilizing MWCNT-ABS filament as starting material

International Technical Postgraduate Conference

Zuikafly, S.N.F.^1 ; Ahmad, F.^1 ; Ibrahim, M.H.^2 ; Latif, A.A.^3 ; Harun, S.W.^4

Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur

54100, Malaysia^1

Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Skudai

81310, Malaysia^2

Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang

43400, Malaysia^3

Photonics Research Centre, Univeristy of Malaya, Kuala Lumpur

50603, Malaysia^4

关键词: Acrylonitrile butadiene styrene;    Fabrication process;    Field emission scanning electron microscopes;    Glass slides;    Passively Q-switched lasers;    Pulse energies;    Pulsewidths;    Repetition rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/210/1/012030/pdf
DOI  :  10.1088/1757-899X/210/1/012030

来源: IOP

【 摘 要 】

This work demonstrated a stable passively Q-switched laser with the employment MWCNTs dispersed in acrylonitrile butadiene styrene (ABS) resin (MWCNTs-ABS) based filament as passive saturable absorber. The simple fabrication process of the SA is further explained, started from the process of extruding the filament through a 3D printer nozzle at 210 °C to reduce the diameter from 1.75 mm to 200 μm. It is then weighed to about 25 mg and mixed with 1 ml acetone before sonicated for 5 minutes to dissolve the ABS. The resultant MWCNTs-acetone suspension is dropped on a glass slide to be characterized using Field-Emission Scanning Electron Microscope (FESEM) and Raman spectroscopy. It is also drop-casted on the end of a fiber ferrule to be integrated in the laser cavity. The proposed work revealed that the laser oscillated at about 1558 nm with threshold input pump power of 22.54 mW and maximum input pump power of 108.8 mW. The increase in pump power resulted in the increase in repetition rate where the pulse train increases from 8.96 kHz to 39.34 kHz while the pulse width decreases from 33.58 μs to 5.14 μs. The generated pulsed laser yields a maximum of 1.01 mW and 5.53 nJ of peak power and pulse energy respectively. The signal-to-noise ratio of 40 dB indicates that the generated pulse is stable.