Self Q-switching of a bismuth doped silica fiber operating at 1.46 μm

Abstract

We demonstrate a self Q-switched Bismuth-doped germanosilicate fiber laser operating at 1463 nm. It is experimentally shown that stable Q-switched pulses with a temporal width of ~ 1.8 μs can be obtained from a simple, all-fiberized Fabry-Perot type cavity without using a saturable absorber at a a repetition rate of ~65 kHz with a pump power of ~260 mW. The tuning capability of the temporal characteristics of the output pulses is also investigated. The possible physical mechanism is discussed.

S-band Q-switched thulium fluoride fiber laser using graphene saturable absorber

“…However, both these approaches have significant limitations; at the time of writing, the DC-EDF can no longer be easily obtained, while the dual-wavelength pumping approach is highly complex and costly. Additional work on bismuth-doped optical fiber lasers has also covered significant portions of the S-band region [38,39]. However, amplification in this region was often difficult to achieve due to the limitations incurred in bismuth-doped fibers by excited state absorption (ESA) and unsaturated pump absorption, even with broad luminescence in the near-infrared (NIR) region [40].…”