Q-switched and mode-locked ytterbium-doped fibre lasers with Sb2Te3 topological insulator saturable absorber

Ahmed H.H. Al-Masoodi; Fauzan Ahmad; Mahmoud H.M. Ahmed; Abtisam H.H. Al-Masoodi; Ibrahim A.M. Alani; Hamzah Arof; Sulaiman Wadi Harun

Q-switched and mode-locked ytterbium-doped fibre lasers with Sb₂Te₃ topological insulator saturable absorber

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Author(s): Ahmed H.H. Al-Masoodi¹ ; Fauzan Ahmad² ; Mahmoud H.M. Ahmed¹ ; Abtisam H.H. Al-Masoodi³ ; Ibrahim A.M. Alani¹ ; Hamzah Arof¹ ; Sulaiman Wadi Harun¹
- Affiliations: 1: Department of Electrical Engineering , Faculty of Engineering , University of Malaya , 50603 Kuala Lumpur , Malaysia ;
  2: Department of Electronics System Engineering , Malaysian Japan International Institute of Technology, Universiti Teknologi Malaysia , 54100 Kuala Lumpur , Malaysia ;
  3: Department of Physics , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
Source: Volume 12, Issue 4, August 2018, p. 180 – 184
DOI: 10.1049/iet-opt.2017.0134 , Print ISSN 1751-8768, Online ISSN 1751-8776

Received 09/10/2017, Accepted 31/01/2018, Revised 07/12/2017, Published 01/02/2018

Q-switched and mode-locked fibre lasers have been successfully demonstrated in ytterbium-doped fibre laser cavity by taking an advantage of the optical absorption of antimony telluride (Sb₂Te₃) material. The Sb₂Te₃ was embedded into polyvinyl alcohol to function as a saturable absorber (SA). A Q-switching pulses train was obtained by incorporating the SA into the laser ring cavity configured with 3 dB coupler. The Q-switching pulse repetition rate increases from 24.4 to 55 kHz as the pump power is increased from the threshold of 75.4–96.2 mW. The maximum pulse energy of 252.6 nJ is obtained at 82.3 mW pump power. On the other hand, by changing the output coupler to 10 dB coupler, a stable self-started mode-locking operation was then generated at pump power range from 47.8 to 89.4 mW with a fixed repetition rate of 24.2 MHz. At 89.4 mW pump power, the maximum output power and pulse energy are obtained to be around 18.6 mW and 0.8 nJ, respectively. The authors results display that the Sb₂Te₃ material could also be developed as an effective SA for both Q-switched and mode-locked fibre lasers.

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Q-switched and mode-locked ytterbium-doped fibre lasers with Sb₂Te₃ topological insulator saturable absorber

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