Datasheet

Components & Accessories

LMA-GDF-20/400-M, Large Mode Area Matched Passive Double Clad Fiber

Product image of LMA-GDF-20/400-M, Large Mode Area Matched Passive Double Clad Fiber

Coherent Large Mode Area (LMA) passive double clad fibers are optimized for high power lasers and amplifiers in industrial, military, and medical applications. These fibers feature a 20 µm core diameter and a 400 µm cladding diameter with a low NA (0.065) core. Precision matched to their active Yb-doped counterparts, they ensure excellent splice compatibility and low loss. NuCOAT fluoroacrylate coating enhances durability, enabling extended operational life even under extreme conditions.

Features

  • NuCOAT fluoroacrylate coating - Ensures durability in extreme environments
  • LMA core design - Suitable for high CW powers
  • “Few” moded core design - Maintains single mode LP01 beam
  • Proof tested to > 100 kpsi - Long-term reliability
  • RoHS compliant

Applications

  • High power fiber lasers
  • CW and pulsed amplifiers
  • Military, industrial, and medical uses
Parameter LMA-GDF-20/400-M
Optical Specifications
Operating Wavelength 1015 - 1115 nm
Core NA 0.065 ± 0.005
Core Attenuation ≤ 8.0 dB/km @ 1200 nm
First Cladding NA ≥ 0.46
Cladding Attenuation ≤ 15.0 dB/km @ 1095 nm
Geometrical & Mechanical Specifications
Cladding Diameter 395.0 ± 5.0 μm
Core Diameter 20.0 ± 1.5 μm
Coating Diameter 550.0 ± 15.0 μm
Core Clad Offset ≤ 2.00 μm
Coating Material NuCOAT fluoroacrylate
Prooftest Level ≥ 100 kpsi (0.7 GN/m²)
Clad Non-Circularity ≤ 0.50 %