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Active Rare-Earth Doped Fibers

Bismuth-Phosphorus co-doped fiber BPDF-SM-6/125-1320 series is specially designed for typical application for amplifiers, lasers, super-fluorescent fiber sources operating at 1270-1370nm.

Specifications

Typical Laser Eff-cy: › 25% (vs pump power at 1240 nm)
Core Absorption (1240 Nm), DB/m: 0.5 ± 0.05
Cutoff Wavelength, µm : 1.05 ± 0.05
Core NA: 0.14 ± 0.02
Amplification Range (-3dB), µm: 1.295 ÷ 1.340
Bismuth-Germanium codoped fiber BGDF-SM-7/125-1430 series is specially designed for typical application for amplifiers, lasers, superfluorescent fiber sources operating at 1370-1490nm.

Specifications

Core Diameter, µm: 6.5 ± 0.6
Clad Diameter, µm: 125 ± 5
Core NA: 0.14 ± 0.02
Cutoff Wavelength, µm : 1.1 ± 0.05
Core Absorption (1310 Nm), DB/m: 0.3 ± 0.05
TDF-SM-10/125 series is specially designed for highly efficient core pumping at 1550-1600 nm.

Specifications

Core Diameter, µm: 10 ± 1.0
Clad Diameter, µm: 125 ± 3
Core NA: 0.18 ± 0.02
Cutoff Wavelength, µm : 1.9 ± 0.05
Core Absorption (1568 Nm), DB/m: › 60
Thulium-Ytterbium codoped fiber TYDF-DC-10/125 series is specially designed for highly efficient pumping with MM pump sources at 915/975nm. Pumping with conventional sources near 790 nm is also possible, as well as core pumping with EDFL operating at 1550-1600nm.

Specifications

Core Diameter, µm: 11.5 ± 1.0
Clad Diameter, µm: 125 ± 3
Clad Shape: square
Core NA: 0.22 ± 0.04
Cutoff Wavelength, µm : 2.6 ± 0.1
Ytterbium doped fiber YDF-DC-10/125 series is designed for operation without any power degradation in a high-peak-power cladding pumped amplifiers. The highest clad absorption over the market allows usage of only 3 m of such fiber (with 976 nm pump) for efficient amplification.

Specifications

Core Diameter, µm: 10.0 ± 1
Clad Diameter, µm: 127 ± 3
Clad Shape: PANDA or octagonal
Core NA: 0.09 ± 0.01
Cutoff Wavelength, µm: 1.05 ± 0.1
LMA Ytterbium doped tapered fiber YDF-DC-40/400-PM-TPR 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 ...

Specifications

Photodarkening Resistance: > 20 times better compare to the Al2O3-SiO2 Yb-doped fiber
Core Diameter Input, µm: 9 ± 1
Core Diameter Output, µm: > 40
Clad Diameter Input, µm: 90 ± 10
Clad Diameter Output, µm: 400 ± 50

Active Rare-Earth Doped Fibers: Enabling High-Power Fiber Lasers and Amplifiers

Active rare-earth doped fibers are crucial components in fiber lasers and amplifiers, enabling efficient light amplification through stimulated emission. These fibers are doped with rare-earth ions such as erbium (Er), ytterbium (Yb), or neodymium (Nd), which serve as gain media when pumped with appropriate light sources.

FindLight provides a variety of rare-earth doped fibers designed for different wavelength regimes and power levels. These fibers are widely used in telecommunications for optical amplification, in industrial laser systems for cutting and welding, and in medical applications for precise laser treatments.

The design of active doped fibers considers factors such as doping concentration, core and cladding geometry, pump absorption efficiency, and compatibility with pump diodes. Proper fiber design ensures high gain, low noise, excellent beam quality, and efficient thermal management.

FindLight’s catalog features fibers optimized for continuous-wave and pulsed laser operation, supporting diverse applications from high-power industrial lasers to compact medical devices. The availability of specialty fibers enables system integrators and researchers to develop customized laser solutions.

Selecting the right doped fiber involves evaluating the pump wavelength, absorption characteristics, emission bandwidth, and mechanical robustness. Active fibers from FindLight ensure superior performance and reliability for advanced photonic systems.

Did You know?

Did you know that active rare-earth doped optical fibers are the backbone of many high-performance laser systems? These fibers are infused with ions from elements like erbium (Er³⁺), ytterbium (Yb³⁺), neodymium (Nd³⁺), and thulium (Tm³⁺), enabling them to amplify light through stimulated emission. When pumped with light from sources such as diode lasers, these ions transition to metastable energy levels and emit coherent light at specific wavelengths, making them ideal for applications in telecommunications, medical devices, and industrial lasers. The choice of dopant determines the emission wavelength: erbium-doped fibers typically emit around 1550 nm, aligning with low-loss transmission windows in silica fibers. Ytterbium-doped fibers are favored for high-power lasers due to their broad emission bandwidth, supporting ultrafast pulses. Thulium and holmium-doped fibers are used for mid-infrared sources, beneficial in medical and sensing applications. Advancements in fiber design, such as double-clad and co-doped configurations, have enhanced pump light absorption and reduced nonlinear effects, enabling more efficient and scalable laser systems.