Tunable 2.0µm Q-switched fiber laser using a silver nanoparticle based saturable absorber

Abstract

A thulium-doped fiber laser (TDFL) with a tunable Q-switched output is proposed and demonstrated. A silver nanoparticle based saturable absorber is used to generate the Q-switched pulses, while a tunable Mach-Zehnder filter acts as the wavelength-tuning mechanism. The TDFL has an operating wavelength range of 1916.5-1945.3 nm, with output pulses that have a repetition rate of 50.1 kHz and a pulse width of 5.1 µs, as well as a pulse energy of 69.3 nJ at the maximum pump power. The Q-switched pulses obtained are very stable and have a signal-to-noise ratio of 34.18 dB.

Tris‐(8‐hydroxyquinoline) aluminium thin film as saturable absorber for passively Q‐switched erbium‐doped fibre laser

“…That might be attributed to SA being bleached under high input pump power. Similar behaviour has been reported with different kinds of SAs [58][59][60]. When the input pump power was decreased to the range between 20 and 122 mW, a stable Q-switching pulses train was produced again, proving that the Alq 3 -based SA was not damaged.…”

In2Se3 saturable absorber for generating tunable Q-switched outputs from a bismuth–erbium doped fiber laser

“…The Bi-EDF has an absorption coefficient of 133 dB m −1 at 1480 nm and a numerical aperture of 0.2. The bismuth glass host is capable of exhibiting broadband gain bandwidth due to a large emission cross-section [37] and high erbium ion concentration without the effects of concentration quenching [38]. These properties are suitable for designing high power, broad band and compact optical fiber amplifiers and lasers.…”

155 nm-wideband and tunable q-switched fiber laser using an MXene Ti3C2TX coated microfiber based saturable absorber

“…Many different materials were explored for their potential as SAs, including transition metal dichalcogenides (TMDs) [13], graphene and carbon nanotubes (CNTs) [14,15] and topological insulators (TIs) [16,17]. This search has also been extended to include a variety of materials typically not considered for use in optical systems, such as titanium dioxide [18], titanium disulfide [19], perovskite [20,21], bismuthine [22], antimonene [23], black phosphorus [24] and silver nanoparticles [25].…”