Abstract
This paper demonstrates on an antimony telluride (Sb2Te3) thin film sandwiched between two fiber ferrule as saturable absorber for Q-switched pulsed Erbium doped fiber (EDF) laser. The saturable absorber is fabricated by dissolving Antimony (III) Telluride powder into PVA solution and dry in the ambient temperature for 48 hours. Then, 1 mm2 x 1 mm2 Sb2Te3-PVA film based saturable absorber is sandwiched in between FC/PC ferrule for Q-switched laser generation. The modulation depth of the Sb2Te3 is measured as 28.01% with input intensity 0.02 MW/cm2. The developed passive saturable absorber integrated in EDF laser in ring cavity and the characterised pulse is with repetition rates of 30.21 kHz, shortest pulse width of 3.26 µs and signal-noise-ratio (SNR) of 42 dB. The maximum output pulse energy is achieved at pump power 69.5 mW with 29.5 nJ and the output power 0.89 mW.
Highlights
Antimony telluride is an intermetallic compound crystallizing in a hexagonal lattice belonging to R-3m space group
A transition of continuous wave (CW) to pulse regime is obtained at pump power of 18.4 mW giving the repetition rate of 13.96 kHz with pulse width of 6.86 μs
The Q-switched pulse Erbium doped fiber (EDF) laser performance is examined at a fixed wavelength and by changing the pump power
Summary
Antimony telluride is an intermetallic compound crystallizing in a hexagonal lattice belonging to R-3m space group. In 2013, J.Sotor et al [4] are the first to present Sb2Te3 as saturable absorber by using mechanical exfoliation technique and transferred onto fiber connector tip It is capable in generating optical solitons at central wavelength of 1558.6 nm with 4.75 MHz repetition rate. As the aim of this study, by utilizing absorption field interaction to generate passively Q-switched pulse EDF laser, Sb2Te3 thin film as a SA sandwiched in between the two fiber ferrules is employed This thin film SA sandwiched method offers easy implementation of the SA and easy generation of Q-switched pulse EDF laser, where the SA layer does not depend on its deposition length. Based on this thin film SA, a stable pulse is obtained with the pulse width of 3.26 μs at repetition rate 30.21 kHz which attracts much attention in applications in laser material processing, remote sensing, medicine, telecommunications, laser spectroscopy and precise optical metrology [7,8,9]
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