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Dual-wavelength Q-switched thulium doped fiber laser with TiO2 film saturable absorber

B. A. AHMAD1, M. F. M. RUSDI2, Z. JUSOH3, A. A. LATIFF4, S. W. HARUN2,*

Affiliation

  1. Department of Communication Engineering, Al-Ma'moon University College, Al-Washash, 700921 Baghdad, Iraq
  2. Photonics Engineering Laboratory, Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
  3. Faculty of Electrical Engineering, Universiti Teknologi Mara (Terengganu), 23000 Dungun, Terengganu, Malaysia
  4. Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia

Abstract

We report a dual-wavelength Q-switched Thulium doped fiber laser based on a Titanium dioxide (TiO2) saturable absorber. The TiO2 was embedded in polyvinyl alcohol (PVA) film, which was then sandwiched in between two fiber ferrules in the cavity. By using a Thulium-doped fiber with a slightly larger core, it functions as intra-cavity spectral filter to allow dual-wavelength Q-switching regime to be achieved in the cavity. Our experimental results show that the fiber laser can simultaneously generate Q-switched microsecond pulses at 1954.43 nm and 1957.27 nm, which have the repetition rate varying from 12.89 kHz to 21.93 kHz and 0.54 μJ maximum pulse energy. Our proposed scheme is quite simple and thus it can be implemented at a low cost..

Keywords

Q-switching, TiO2 saturable absorber, Thulium-doped fiber laser, Dual-wavelength laser.

Citation

B. A. AHMAD, M. F. M. RUSDI, Z. JUSOH, A. A. LATIFF, S. W. HARUN, Dual-wavelength Q-switched thulium doped fiber laser with TiO2 film saturable absorber, Optoelectronics and Advanced Materials - Rapid Communications, 12, 5-6, May-June 2018, pp.249-252 (2018).

Submitted at: Oct. 18, 2017

Accepted at: June 7, 2018