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Part #:
PM-TDF-40/400

Eye Safe Large Core Thulium-Doped Multimode Double Clad Fiber

Nufern Thulium-doped double clad fiber utilizes a glass composition specifically optimized for highly efficient operation around the important 2 µm wavelength when pumped at ~ 793 nm. The high Tm concentration of these fibers allows short device lengths and high pump conversion efficiency. The high NA (0.46) large pump cladding waveguide allows for efficient coupling of high pump powers while the ultra-large core diameter (55 µm) facilitates ultra-high output powers without the onset of parasitic non-linear effects such as SBS and SRS.
Applications
  • High power CW and pulsed Eye Safe (~2 µm) lasers and amplifiers
  • Eye Safe industrial and medical lasers
  • Military and commercial LIDAR
Features & Benefits
  • Optimized composition for 793 nm pumping - Very high conversion efficiency
  • High pump absorption - Short fiber length, efficient lasing in the ~2 µm window

Optical Specifications

Operating Wavelength (nominal)2000 nm
Peak Absorption4 dB/m near 793 nm (nominal)
1.3 ± 0.3 dB/m near 1180 nm
Core Numerical Aperture (nominal)0.20
Cladding Numerical Aperture (5%)≥ 0.46
Birefringence 1.5 x 10-4

Geometrical & Mechanical Specifications

Core Diameter40.0 ± 4.0 µm
Clad Diameter400.0 ± 15.0 µm
Coating Diameter550 ± 20 µm
Core-Clad Concentricity≤ 3.0 µm
Coating MaterialLow Index Polymer
Proof Test Level≥ 100 kpsi (0.7 GN/m²)

Note: Perfectly matched passive versions are available for many of our active fibers.
See our Component and Delivery Fibers cheat sheet. (PDF)

RoHS Compliant