We demonstrate a Q-switched erbium-doped fiber laser using tungsten disulfide (WS₂) as a saturable absorber. The WS₂ is deposited onto fiber ferrules using a drop-casting method. Passive Q-switched pulses operating in the C-band region with a central wavelength of 1560.7 nm are successfully generated by a tunable pulse repetition rate ranging from 27.2 to 84.8 kHz when pump power is increased from 40 to 220 mW. At the same time, the pulse width decreases from a maximum value of 3.84 μs to a minimum value of 1.44 μs. The signal-to-noise ratio gives a stable value of 43.7 dB. The modulation depth and saturation intensity are measured to be 0.99% and 36.2 MW/cm², respectively.

Sivabalan S

Department of Instrumentation

School of Electrical Engineering

Vellore Campus

Ahmad H

Ruslan N.E

Ismail M.A

Reduan S.A

Lee C.S.J

Sathiyan S

Harun S.W.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Passively Q-switched erbium-doped fiber laser at C-band region based on WS₂ saturable absorber

Applied Optics

Ultrashort pulsed laser is an indispensable tool for the evolution of photonic technology in the present and future. This laser has been progressing tremendously with new pulse regimes and incorporating novel devices inside its cavity. Recently, a nanomaterial based saturable absorber (SA) was used in ultrafast laser that has improved the lasing performance and caused a reduction in the physical dimension when compared to conventional SAs. To date, the nanomaterials that are exploited for the development of SA devices are carbon nanotubes, graphene, topological insulators, transition metal dichalcogenides (TMDs) and black phosphorous. These materials have unique advantages such as high nonlinear optical response, fiber compatibility and ease of fabrication. In these, TMDs are prominent and an emerging two-dimensional nanomaterial for photonics and optoelectronics applications. Therefore, we review the reports of Q-switched and mode-locked pulsed lasers using TMDs (specifically MoS2, MoSe2, WS2 and WSe2) based SAs. © 2016 Elsevier B.V.

Optical Materials

Transition metal dichalcogenides based saturable absorbers for pulsed laser technology

Scientific Reports

Yb- and Er-doped fiber laser Q-switched with an optically uniform, broadband WS2 saturable absorber

Passively mode-locked fiber laser by a cell-type WS2 nanosheets saturable absorber

Optics Express

Q-switched fiber laser based on transition metal dichalcogenides MoS_2, MoSe_2, WS_2, and WSe_2

Journal of Lightwave Technology

Femtosecond Soliton Pulse Generation Using Evanescent Field Interaction Through Tungsten Disulfide (WS 2) Film

IEEE Photonics Technology Letters

Ultrafast Pulsed All-Fiber Laser Based on Tapered Fiber Enclosed by Few-Layer WS2 Nanosheets

Passively Q-switched erbium-doped fiber laser at C-band region based on WS_2 saturable absorber

Journal	Data powered by TypesetApplied Optics
Publisher	Data powered by TypesetThe Optical Society
ISSN	0003-6935
Impact Factor	1.230
Open Access	No
Citation Style	unsrt
Sherpa RoMEO Archiving Policy	Green