Smart Product Number: LMA-TDF-25P/250-M
Eye Safe 25P/250 Thulium-Doped LMA Double Clad Fibers
Nufern introduces the newest series of large-mode area, high efficiency Thulium-doped double clad fibers inspired from the most recent advances in thulium-doped technology. The glass composition is improved to maximize the cross-relaxation process in order to achieve 2 mm efficiencies around 60% and higher when pumping at ~793 nm. In addition, the waveguide design is specifically tailored to offer improved beam quality. The pedestal layer surrounding the core is optimized to guarantee efficient higher-order mode suppression and high beam quality while ensuring highly reliable splicing and easy handling and cleaving. Both fibers feature a 25 µm core (0.09 NA) and a 250 µm clad diameter allowing for a large mode field diameter and short device lengths thereby minimizing non-linear effects such as SBS and SRS. The - M fiber is compatible with the NuMATCH passive fiber family offering unique compatibility performances.in the higher 2 µm wavelength gain spectrum. The -LC fiber features a lower concentration Tm-concentration best suited to operate in the shorter wavelength region of the 2 mm gain spectrum.
Optical Specifications
Operating Wavelength
1900 – 2100 nm
Core NA
0.090 ± 0.010
First Cladding NA (5%) ≥ 0.460
Cladding Attenuation
≤ 15 dB/km @ 860 nm
Cladding Absorption
2.10 ± 0.30 dB/m at 1180 nm
6.30 dB/m at 793 nm
Geometrical & Mechanical Specifications
Cladding Diameter
250.0 ± 5.0 µm
Core Diameter
24.0 ± 1.5 µm
Coating Diameter
395.0 ± 15.0 µm
Core/Clad Offset
≤ 2.00 μm
Coating Material
Low Index Acrylate
Prooftest Level
≥ 100 kpsi (0.7 GN/m²)
Comments
Coating Requirements: Low index polymer NuCoat-FA.
Features & Benefits
Improved core composition – Efficiencies greater than 60%
Optimized LMA core & pedestal design — robust single-mode beam quality
NuCOATFA™ fluoroacrylate coating — Greater fiber durability in extreme operating and storage conditions
All fiber proof tested to > 100 kpsi — Critical for ensuring long term reliability when coiling
Typical Applications
High peak power pulsed fiber amplifiers & lasers
Eye Safe industrial & medical lasers
Military and commercial LIDAR
Pumping of Ho-doped lasers & amplifiers
商品属性 [波长] 1900 - 2100 nm [掺杂类型] Tm [芯径大小] 24 µm [首包层直径] 250 µm [数值孔径] 0.090 [光学包层] Double