Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6888264 | Optical Fiber Technology | 2018 | 5 Pages |
Abstract
We demonstrate a Q-switched all-fiber laser operating at 2-µm region by adding a piece of 8â¯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 3â¯dB with a core diameter and a numerical aperture of 10â¯Âµm and 0.18, respectively. A self-started Q-switching operation begins at 418â¯mW pump level and continually dominant until 564â¯mW pump level. As the pump power increases, stable pulse train presence from 30.61â¯kHz to 38.89â¯kHz while the pulse width reduces from 3.18â¯Âµs to 2.27â¯Âµs. Both maximum output power and maximum peak power are obtained at 5.05â¯mW and 57.2â¯mW, respectively, while the maximum pulse energy is calculated to be 129â¯nJ. The signal-to-noise ratio (SNR) of the fundamental frequency is 50â¯dB. Our work may contribute to the discovery of stable, robust, and economic SA for pulse fiber laser generation at 2-µm region.
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Authors
M.F.A. Rahman, A. Dhar, S. Das, D. Dutta, M.C. Paul, M.F.M. Rusdi, A.A. Latiff, K. Dimyati, S.W. Harun,