Passive Q-switching in an erbium-doped fiber laser using tungsten sulphoselenide as a saturable absorber

Ahmad, Harith and Tiu, Zian Cheak and Ooi, Shok Ing (2018) Passive Q-switching in an erbium-doped fiber laser using tungsten sulphoselenide as a saturable absorber. Chinese Optics Letters, 16 (2). 020009. ISSN 1671-7694, DOI

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A highly stable Q-switched laser incorporating a mechanically exfoliated tungsten sulphoselenide (WSSe) thin sheet saturable absorber (SA) is proposed and demonstrated. The SA assembly, formed by sandwiching a thin WSSe sheet between two fiber ferrules within the erbium-doped fiber laser, is used to effectively modulate the laser cavity losses. The WSSe-based SA has a saturation intensity of ~0.006 MW/cm2 and a modulation depth of 7.8%, giving an optimum Q-switched laser output with a maximum repetition rate of 61.81 kHz and a minimum pulse width of 2.6 μs. The laser's highest output power of 0.45 mW and highest pulse energy of 7.31 nJ are achieved at the maximum pump power of 280.5 mW. The tunability of the cavity's output at the maximum pump power is analyzed with a C-band tunable bandpass filter, giving a broad tunable range of ∼40 nm, from 1530 nm to 1570 nm. The output performance of the tunable Q-switched laser correlates well with the gain spectrum of erbium-doped fibers, with the shift in the gain profile as a result of the saturated SA.

Item Type: Article
Funders: Ministry of Higher Education, Malaysia (Grant No. LRGS (2015) NGOD / UM / KPT), University of Malaya (Grant Nos. RU 001-2017 and RP 029A –15 AFR)
Uncontrolled Keywords: Erbium doped fiber laser; Erbium doped fibers; Maximum pump power; Minimum pulse widths; Passive Q-switching; Saturation intensity; Tunable band-pass filters; Tungsten sulphoselenide
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 Oct 2019 00:52
Last Modified: 07 Oct 2019 00:52

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