High power, tunable, ultra-narrowband Yb-doped superfluorescent fiber source operating at wavelength less than 1055 nm with 20 nm tuning range

2-kW-level superfluorescent fiber source with flexible wavelength and linewidth tunable characteristics

“…However, the output power was limited to a 100-mW level because of the space structure and the onset of parasitic lasing. In 2020, Ju et al [26] achieved a tunable SFS with the ultra-narrow linewidth of 0.088 nm, and the operating wavelength could be tuned from 1035 to 1055 nm with an output power of more than 300 W. In the same year, Li et al [27] boosted the output power of a tunable narrowband SFS to the kilowatt level, in which the wavelength tuning range reached 40 nm and the full width at half maximum (FWHM) linewidth was less than 0.71 nm.…”

“…Moreover, based on the master oscillator power amplifier (MOPA) configuration, the output power of narrowband SFS has been scaled to several kilowatts [23,24]. Besides the narrowband spectrum with fixed central wavelength, high power wavelength tunable SFS has also gained much attention in recent years [25][26][27]. In 2009, Wang et al first reported a tunable Yb-doped SFS with a wavelength tuning range of 1034-1084 nm and a linewidth narrower than 0.5 nm [25].…”

“…achieved a tunable SFS with the ultra-narrow linewidth of 0.088 nm, and the operating wavelength can be tuned from 1035 to 1055 nm with an output power of more than 300 W [26].…”

Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

“…Meanwhile, due to the lower fractional thermal load as a result of the higher quantum efficiency, the thresholds of the transverse mode instability (TMI) [5][6][7] for the SWs fiber lasers based on ytterbium-doped fiber lasers (YDFL) are usually higher than those for the longer-wavelength fiber lasers operating around 1080 nm, which made the SWs fiber lasers promising for high-power systems [8,9]. However, due to the significantly higher levels of ASE induced by large signal absorption cross sections [10], high-power fiber laser systems operating at SWs around or below 1 µm [11] are found to be much more challenging compared to traditional wavelength band fiber lasers [12].…”