Time-resolved spectroscopy and optical gain of silica-based fibers co-doped with Bi, Al and/or Ge, P, and Ti

Bi-doped fiber lasers

“…Spectra are obtained using time-resolved spectroscopy. AGSB fiber reveals similar luminescence properties [42] Gain saturation observed at the pump power increase leads us to the conclusion that maximum gain in the Bi-doped fiber under investigation is about ∼ 0.5 dB/m. At low pump levels gain efficiency is as high as 0.2 dB/mW (at 1120 nm), which is lower if compared to Er-doped fiber amplifies, but is significantly higher if compared to Raman ones [41].…”

“…The on/off gain spectra for PGSB, GSB, and PSB fibers are shown in Fig. 12 [31,43]. The similar spectrum for ASB fibers pumped at 1343 nm is shown in Fig.…”

“…Fig. 10 demonstrates gain coefficient spectral dependencies for three types of Bi-doped fibers [28,32,40]. The luminescence spectra of the same fibers (normalized to unit magnitude) are also shown for comparison.…”

Optical properties of the Bi+ center in KAlCl4

“…A lot of various Bi-centers that could be responsible for the observed NIR luminescence were suggested: BiO, Bi + , Bi 2 4+ , Bi 5 3+ , Bi 8 2+ , Bi 2 2-, Bi 2 -, Bi 4 , Bi-related defects etc. Often several luminescent species are observed simultaneously in a Bi-doped media [8,10,[22][23][24][25]. To date only a few Bi-luminescent centers (e.g.…”

2 W bismuth doped fiber lasers in the wavelength range 1300-1500 nm and variation of Bi-doped fiber parameters with core composition

“…It was expected that these fibers could have some amplification, because the short-lived BACs were absent [15]. Indeed, we could detect amplification in Bi-doped phosphogermanosilicate fibers.…”