Passively Q-switching of Erbium-doped fiber laser using ferrite as saturable absorber

Abstract

We report on passive Q-switching of a erbium-doped fiber laser with ferrite saturable absorber achieving for the first time short (~3.2 μs) pulse durations with a low threshold pump power (~15 mW).

Fe3O4nanoparticles as the saturable absorber for a mode-locked fiber laser at 1558 nm

“…Several types of SAs have been investigated to realize passive mode-locked fiber lasers, such as semiconductor SA mirrors [6,7], carbon nanotubes [8][9][10], graphene [11][12][13], transition metal dichalcogenides [14][15][16][17], topological insulators [18,19], and metal nanoparticles [20][21][22]. In this regard, transition metal oxide (TMO)-based SAs have now emerged as a new branch of SA materials due to their wide absorption band induced by surface plasmon resonance, large nonlinearity, high optical damage threshold and fast recovery time [23][24][25][26][27][28]. Zinc oxide (ZnO), titanium dioxide (TiO 2 ), Nickel oxide (NiO), and copper oxide (CuO) have been fabricated and investigated as SAs for pulsed lasers [24,25,29,30].…”

Q-switched erbium-doped fibre laser based on molybdenum disulfide and tungsten disulfide as saturable absorbers

“…It is worthwhile that fabrication process of the semiconductor SA mirrors is complicated and expensive. On the other hand, although single-walled carbon nanotube-based SAs are simple to fabricate and cost-effective, they reveal low damage thresholds and cannot provide a desired wavelength range of SA without matching diameter-dependent bandgap [8].…”