Research Papers

Passive mode-locking at S-band by single-mode thulium-doped fluoride fiber using a thin film PtAg/N-G saturable absorber

[+] Author Affiliations
Harith Ahmad, Mojgan Tajdidzadeh, Majid Rezayi, Iraj S. Amiri

University of Malaya, Photonics Research Centre, Kuala Lumpur, Malaysia

J. Nanophoton. 11(2), 026008 (May 22, 2017). doi:10.1117/1.JNP.11.026008
History: Received March 22, 2017; Accepted May 3, 2017
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Abstract.  We report, for the first time to our knowledge, the usage of platinum silver bimetallic alloy forms on the synthesized N-Gns (PtAg/N-G) as a saturable absorber (SA) for the mode-locking of a thulium-doped fluoride fiber laser. The experimental results have demonstrated that PtAg/N-G exhibits saturable absorption in the 1.5-μm wavelength range and supports ultrashort pulse generation. Mode-locking occurred when the pump power rose to 340 mW, and the output spectrum had a peak at 1506 nm with the 3-dB bandwidth of 0.76  nm. The mode-locked pulse train against a cavity roundtrip time of 146 ns that corresponds to a pulse repetition rate around 6.85 MHz. The autocorrelation trace 7.43 ps with a full width at half maximum pulse width of 4.8 ps, and experimental data were closely fit with a sech2 pulse shape and it indicates the generation of soliton pulse. The output power of this fiber laser is 3.24 mW; hence, the pulse energy is 0.31 nJ and peak power is about 56.9 mW as well. We demonstrate graphene-polymer nanocomposites could be an appropriate SA for high-power fiber laser mode-locking.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Harith Ahmad ; Mojgan Tajdidzadeh ; Majid Rezayi and Iraj S. Amiri
"Passive mode-locking at S-band by single-mode thulium-doped fluoride fiber using a thin film PtAg/N-G saturable absorber", J. Nanophoton. 11(2), 026008 (May 22, 2017). ; http://dx.doi.org/10.1117/1.JNP.11.026008


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