Author(s) Salman, A.A.; Al-Janabi, H.
Journal Appl Opt
Date Published 2019 Jun 01

We report on the generation of a stable multiwavelength Q-switched erbium-doped fiber laser based on tungsten oxide nanoparticles (WO NPs) combined with an intracavity comb filter for the first time, to the best of our knowledge. The prepared WO-PVA thin film has a modulation depth and saturable intensity of 20% and 100  MW/cm, respectively. A spectrum of up to 15 peaks with a channel spacing of 0.48 nm has been obtained. In the Q-switching regime, a minimum pulse width of 4.24 μs and a maximum repetition rate of 52.49 kHz were achieved at a maximum pump power of 300 mW. The dual effect of WO NPs in saturable absorption and high optical nonlinearity has induced pulsed and four-wave mixing effects. Therefore, the intrinsic advantages of WO nanomaterial provide a promising source for the realization of a stable multiwavelength fiber laser.

DOI 10.1364/AO.58.004332
ISSN 1539-4522
Citation Appl Opt. 2019;58(16):43324336.

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