An 8 cm long holmium-doped fiber saturable absorber for Q-switched fiber laser generation at 2-µm region

Rahman, Mohd Fauzi Ab and Dhar, Anirban and Das, Shyamal and Dutta, Debjit and Paul, Mukul Chandra and Rusdi, Muhammad Farid Mohd and Latiff, Anas Abdul and Dimyati, Kaharudin and Harun, Sulaiman Wadi (2018) An 8 cm long holmium-doped fiber saturable absorber for Q-switched fiber laser generation at 2-µm region. Optical Fiber Technology, 43. pp. 67-71. ISSN 1068-5200, DOI

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We demonstrate a Q-switched all-fiber laser operating at 2-µm region by adding a piece of 8 cm long holmium doped fiber (HDF) as a fiber saturable absorber (SA) in Thulium doped fiber laser (TDFL) ring cavity. Doping of Ho ions into yttria-alumina silica glass was done through conventional Modified Chemical Vapor Deposition (MCVD) technique in conjunction with solution doping process. The fabricated HDF has a linear absorption of 3 dB with a core diameter and a numerical aperture of 10 µm and 0.18, respectively. A self-started Q-switching operation begins at 418 mW pump level and continually dominant until 564 mW pump level. As the pump power increases, stable pulse train presence from 30.61 kHz to 38.89 kHz while the pulse width reduces from 3.18 µs to 2.27 µs. Both maximum output power and maximum peak power are obtained at 5.05 mW and 57.2 mW, respectively, while the maximum pulse energy is calculated to be 129 nJ. The signal-to-noise ratio (SNR) of the fundamental frequency is 50 dB. Our work may contribute to the discovery of stable, robust, and economic SA for pulse fiber laser generation at 2-µm region.

Item Type: Article
Uncontrolled Keywords: Fiber laser; Q-switching; Fiber saturable absorber; Thulium doped fiber; Gain medium
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 17 Apr 2019 08:54
Last Modified: 17 Apr 2019 08:54

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