Square pulse emission with ultra-low repetition rate utilising non-linear polarisation rotation technique
- Author(s): Sin Jin Tan 1, 2 ; Zian Cheak Tiu 1, 2 ; Sulaiman Wadi Harun 1, 2 ; Harith Ahmad 2
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View affiliations
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Affiliations:
1:
Department of Electrical Engineering , Faculty of Engineering , University of Malaya , 50603 Kuala Lumpur , Malaysia ;
2: Photonics Research Center , University of Malaya , 50603 Kuala Lumpur , Malaysia
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Affiliations:
1:
Department of Electrical Engineering , Faculty of Engineering , University of Malaya , 50603 Kuala Lumpur , Malaysia ;
- Source:
Volume 2014, Issue 9,
September
2014,
p.
517 – 521
DOI: 10.1049/joe.2014.0188 , Online ISSN 2051-3305
The generation of nanosecond square pulse and microsecond harmonic pulse in a passively mode-locked fibre ring laser is demonstrated by inserting a 20 km long single mode fibre in the cavity. The laser operates in anomalous region based on the non-linear polarisation rotation process. The square pulse generation is because of the dissipative soliton resonance effect, which clamps the peak intensity of the laser and broadens the pulse width. The pulse width can be tuned from 28.2 to 167.7 ns. It was found that the square pulse can deliver higher pulse energy compared with the harmonic pulse. The highest recorded pulse energy is 249.8 nJ under the maximum available pump power of 125 mW without pulse breaking.
Inspec keywords: optical pulse generation; fibre lasers; light polarisation; ring lasers; optical harmonic generation; laser mode locking; laser tuning; optical rotation; laser cavity resonators; optical solitons
Other keywords: laser cavity; nonlinear polarisation rotation technique; time 28.2 ns to 167.7 ns; passively mode-locked fibre ring laser; pulse width broadening; pulse energy; dissipative soliton resonance effect; ultralow repetition rate; laser peak intensity; microsecond harmonic pulse generation; pump power; nanosecond square pulse generation; square pulse emission; power 125 mW; pulse width tuning; single mode fibre
Subjects: Laser beam modulation, pulsing and switching; mode locking and tuning; Design of specific laser systems; Laser resonators and cavities; Fibre lasers and amplifiers; Laser beam modulation, pulsing and switching; mode locking and tuning; Optical solitons; Fibre lasers and amplifiers; Ultrafast optical techniques; Optical solitons; Optical harmonic generation, frequency conversion, parametric oscillation and amplification; Optical harmonic generation, frequency conversion, parametric oscillation and amplification; Laser resonators and cavities
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-
-
24)
-
15. Zhang, Z.X., Zhan, L., Yang, X.X., Luo, S.Y., Xia, Y.X.: ‘Passive harmonically mode-locked erbium doped fiber laser with scalable repetition rate up to 1.2 GHz’, Laser Phys. Lett., 2007, 4, (8), pp. 592–596 (doi: 10.1002/lapl.200710017).
-
-
25)
-
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-
-
26)
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-
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