Square pulse emission with ultra-low repetition rate utilising non-linear polarisation rotation technique

The Journal of Engineering

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

关键词: optical harmonic generation;    optical pulse generation;    fibre lasers;    ring lasers;    laser mode locking;    laser cavity resonators;    optical rotation;    light polarisation;    optical solitons;    laser tuning;    square pulse emission;    ultralow repetition rate;    nonlinear polarisation rotation technique;    nanosecond square pulse generation;    microsecond harmonic pulse generation;    passively mode-locked fibre ring laser;    single mode fibre;    laser cavity;    dissipative soliton resonance effect;    laser peak intensity;    pulse width broadening;    pulse width tuning;    pulse energy;    pump power;    time 28.2 ns to 167.7 ns;    power 125 mW;   

DOI  :  10.1049/joe.2014.0188

来源: publisher

【 摘 要 】

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.

【 授权许可】

CC BY