Smart Product Number: LMA-TDF-25P/400-HE
Eye Safe 25P/400-HE Thulium-Doped LMA Double Clad Fiber
True LMA fiber featuring a unique low NA (<0.1) high concentration Tm-doped core design. It is fully optimized for high slope efficiency (composition has demonstrated > 130% quantum efficiency) when pumped at 793 nm. This extraordinary efficiency is due to composition enabled cross relaxation of Thulium ions in the core. The high TM concentration allows short device lengths and high pump conversion efficiency while the low NA (few moded) core design is ideal for applications where robust single-mode beam quality is critical. The high NA (0.46) 400 µm pump cladding waveguide allows for efficient coupling of high pump powers. The large core diameter (25 µm) maintains a large field diameter and short device length, thereby minimizing non-linear effects such as SBS and SRS.
Optical Specifications
Operating Wavelength
1900 – 2100 nm
Core NA
0.090
First Cladding NA (5%) ≥ 0.460
Cladding Attenuation
≤ 15.0 dB/km @ 860 nm
Cladding Absorption
0.60 ± 0.10 dB/m at 1180 nm
1.80 dB/m at 793 nm
Geometrical & Mechanical Specifications
Cladding Diameter (flat-to-flat) 400.0 ± 15.0 µm
Core Diameter
25.0 ± 2.5 µm
Coating Diameter
550.0 ± 20.0 µm
Coating Material
Low Index Acrylate
Prooftest Level
≥ 100 kpsi (0.7 GN/m²)
Comments
Coating Requirements: Low-index polymer coating.
Features & Benefits
Unique low NA Tm-doped core design - Robust single-mode beam quality
Optimized composition for 793 nm pumping - Very high conversion efficiency
High pump absorption - Short fiber length, efficient lasing in the ~2 µm window
Typical Applications
High power CW and pulsed EyeSafe (~2 μm) lasers and amplifiers
EyeSafe industrial and medical lasers
Military and commercial LIDAR
~2 μm output TEM00 fiber lasers for pumping solid state crystal lasers
商品属性 [波长] 1900 - 2100 nm [掺杂类型] Tm [芯径大小] 25 µm [首包层直径] 400 µm [数值孔径] 0.090 [光学包层] Double