Generation of Q-switched fiber laser at 1.0-, 1.55-and 2.0-mu m employing a spent coffee ground based saturable absorber
Document Type
Article
Publication Date
1-1-2021
Abstract
Spent coffee ground (SCG) was demonstrated as saturable absorber (SA) for Wideband Q-switched fiber lasers generation. The SCG SA has a broad linear absorption that covers from 1000 nm to 2000 nm wavelength and a modulation depth of 30% at 1.55-mu m region. Through purification process, the finer SCG powder is obtained, and be embedded with a polyvinyl alcohol for thin film formation. To realize Q-switching operation lasers, a fabricated SCG film was integrated into three different fiber laser cavities including ytterbium-doped fiber laser, erbium-doped fiber laser, and thulium-doped fiber laser. A peak wavelength has obtainable at 1031 nm, 1563 nm, and 1976 nm for 1-, 1.55-, and 2- mu m regions, respectively. The shortest pulse width of 4.80 mu s and maximum pulse energy of 0.152 mu J are observed from the YDFL cavity. RF spectrum shows the signal-to-noise ratio for all regions is above 35 dB, indicates a stable pulsing generation. Our technique opens the door for unlimited materials SA from environmentally friendly resources which contribute to sustainable effort.
Keywords
Q-switching operation, Ytterbium-doped fiber, Erbium-doped fiber, Thulium-doped fiber, Fiber laser, Saturable absorber, Spent coffee ground
Divisions
Science
Funders
Centre for Telecommunication Research and Innovation (CeTRI), Universiti Teknikal Malaysia Melaka (UTeM),Universiti Malaya,Ministry of Education (MOE), Malaysia[R.J130000.7854.5F183],Universiti Teknologi Malaysia (UTM)[R.J130000.7854.5F183]
Publication Title
Optical Fiber Technology
Volume
61
Publisher
Elsevier
Publisher Location
STE 800, 230 PARK AVE, NEW YORK, NY 10169 USA