56 nm Wide-Band Tunable Q-Switched Erbium Doped Fiber Laser with Tungsten Ditelluride (WTe2) Saturable Absorber
Document Type
Article
Publication Date
1-1-2020
Abstract
A wide-band and tunable Q-switched erbium-doped fiber (EDF) laser operating at 1560.5 nm with a tungsten ditelluride (WTe2) saturable absorber (SA) is demonstrated. The semi-metallic nature of WTe2 as well as its small band gap and excellent nonlinear optical properties make it an excellent SA material. The laser cavity uses an 89.5 cm long EDF, pumped by a 980 nm laser diode as the linear gain while the WTe2 based SA generates the pulsed output. The WTe2 based SA has a modulation depth, non-saturable loss and saturation intensity of about 21.4%, 78.6%, and 0.35 kW/cm2 respectively. Stable pulses with a maximum repetition rate of 55.56 kHz, narrowest pulse width of 1.77 µs and highest pulse energy of 18.09 nJ are obtained at the maximum pump power of 244.5 mW. A 56 nm tuning range is obtained in the laser cavity, and the output is observed having a signal to noise ratio (SNR) of 48.5 dB. The demonstrated laser has potential for use in a large number of photonics applications. © 2020, The Author(s).
Keywords
Saturable Absorbers, Erbium-Doped Fiber, Mode-locked Fiber Lasers
Divisions
photonics
Funders
University of Malaya: grants BKS002 - 2019, RK021 -2019 and RU011 - 2019,Ministry of Higher Education, Malaysia: grant HiCoE Phase II Funding
Publication Title
Scientific Reports
Volume
10
Issue
1
Publisher
Nature Research