Ytterbium-Doped Fiber YDF-SM-6/125
Single-mode active fiber for core-pumped lasers and amplifiers — with stable output power across its full service life.
YDF-SM-6/125 is a single-mode ytterbium-doped fiber for core-pumped laser and amplifier schemes. Its standard 6/125 µm geometry splices directly to telecom-grade passive fibers, while class-leading photodarkening resistance keeps output power stable where reliability and lifetime matter most.
Advantages
1. Highest nonlinear threshold on the market — up to 0.5 MW peak power before onset of nonlinear effects, thanks to high Yb concentration and a short taper length.
2. Diffraction-limited beam quality — clean output beam even at extreme peak powers.
3. All-glass double-clad design — highly F-doped second cladding (NA ≈ 0.26) allows simple, reliable polishing of the thick 400 µm end.
4. Dual-end architecture — single-mode 8/80 µm input, LMA 40/400 µm output, no extra mode-matching components needed.
5. Polarization-maintaining — preserves linear polarization through the taper for coherent/narrow-linewidth systems.
6. No power degradation — engineered for stable operation without power roll-off over time.
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Ytterbium doped fiber | YDF-SM-6/125 |
| Core diameter, µm | 5.5 ± 0.7 |
| Clad diameter, µm | 125 ± 3 |
| Coating diameter, µm | 240 ± 30 |
| Core NA | 0.16 ± 0.02 |
| Cutoff wavelength, µm | 0.9 ± 0.1 |
| Core absorption (915 nm), dB/m | 150 ± 25 |
| Core absorption (976 nm), dB/m | > 750 ± 130 |
| Background loss (1150 nm), dB/km | < 30 |
| Effective pumping range, µm | 0.91 - 0.984 |
| Photodarkening resistance | > 20 times better compare to the Al2O3-SiO2 Yb-doped fiber |
| Other parameters including PM version are available on the request | |
