Experimental and theoretical analysis of the resonant nonlinearity in ytterbium-doped fiber

Resonantly Induced Refractive Index Changes in Yb-doped Fibers: the Origin, Properties and Application for All-Fiber Coherent Beam Combining

“…The phase traces shown in figure 10(a) highlight significant differences in the phase slopes δϕδ τ referenced to different T . Qualitatively similar results have been reported earlier for the two-core Ybdoped fibers (Arkwright et al, 1998). However, in our case the measured dispersion of the factor () T K λ is found to be coincide with the dependence The relative polarizability difference dispersion (points) in comparison with wavelength dependencies expressed by the first (resonance) and the second (non-resonance) terms of equation (3), and the dependence…”

“…An alternative model suggests the predominant contribution from the second term responsible for strong UV transitions located far from the resonance (Digonnet et al, 1997), similar to those observed in laser crystals (Antipov et al, 2003(Antipov et al, , 2006Margerie et al, 2006;Messias et al, 2007). Correct understanding of these electronic phenomena in Yb-doped fibers (Arkwright et al, 1998) is very important for numerous fiber applications. The pump-induced RICs could significantly affect the fiber laser behavior.…”

Effect of TEOS addition on formation of Au metal nano-particles in the Au-doped optical fiber and its optical nonlinearity

“…On the other hand, the n 2 of the Au MNPs-doped fiber (without TEOS) was from 1.43 × 10 −16 to 0.97 × 10 −16 m 2 /W at the pump power from 12 mW to 100 mW. Note that n 2 value of the reference GeO 2 -doped fiber without Au MNPs was from 0.91×10 −16 to 0.17 × 10 −16 m 2 /W at the pump power from 31 mW to 102 mW, demonstrating that the high resonant nonlinearity was induced from the host germanosilicated dielectric glass matrix upon pumping at the wavelength near UV edge [7,30]. The n 2 of the Au MNPs-doped fiber (with TEOS) was about 1.3 times and 7.5 times larger than that of Au MNPs-doped fiber (without TEOS) and the reference fiber (without Au MNPs), respectively at the pump power of 100 mW.…”

Resonant and thermal changes of refractive index in a heavily doped erbium fiber pumped at wavelength 980nm

“…Finally, the overall change of refractive index ⌬n ⌺ at the signal wavelength , when it is pumped at the wavelength pump , is to be written as ⌬n ⌺ = ⌬n res + ⌬n therm that is a sum of the resonant [Eq. (3)] and thermal parts [Eq. (6)].…”