LMA Ytterbium doped tapered fiber
Large mode area ytterbium doped double clad polarization-maintaining tapered fiber YDF-DC-40/400-PM-TPR-2.5-A series is designed for operation without any power degradation in extremely high-peak-power cladding-pumped amplifiers. The new tapered fiber design has a single-mode end (typical dimension is 8/80 µm) for signal input and a very-large-mode-area end (typical dimension is 40/400 µm) for signal output and pump input. The all-glass double-clad fiber design (based on highly F-doped second cladding with typical NA=0.26) allow simple polishing of the thick 400 µm fiber end. Due to a high Yb concentration and a short tapered fiber length amplifiers based on this fiber has the highest threshold of nonlinear effects over the market (up to 0.5 MW) together with the diffraction limited beam quality at the output.


LMA Ytterbium doped tapered fiber

Type of signalSignal input endSignal output / pump input end
Core diameter, µm9 ± 1> 40
Clad diameter, µm90 ± 10400 ± 50
Cutoff wavelength, µm< 1.0-
MFD, µm10.0 ± 2.0> 24 (25-30 typical)
Core NA0.09 ± 0.01
Clad NA> 0.26
Clad shapePANDA with F-doped second cladding
Clad absorption (915 nm), dB/m> 4
Clad absorption (976 nm), dB/m> 15
Core background loss (1150 nm), dB/km< 50
Photodarkening resistance> 20 times better compare to the Al2O3-SiO2 Yb-doped fiber
Other parameters are available on the request
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