GenX Precision Matched Active

LMA Double Clad Fiber

GenX fibers are the newest series of Large Mode Area (LMA) double-clad fibers, specifically tailored to enable power

scaling of multi-kW -class fiber lasers and amplifiers. Offering superior photo-darkening (PD) performances with maintained

and/or higher absorption, these fibers are optimized to benefit both CW and pulsed multi-kW systems. The 14/250 GenX

design is ideal for efficient and reliable kW-class systems. The 20/400 GenX offers the same absorption with significantly

lower PD than comparable products providing an optimized platform for high efficiency and high-reliability multi-kW CW

lasers. The 25/250 GenX product combines higher absorption and superior PD, ideal for enabling multi-kW peak power

scaling with reduced cavity length and nonlinearities.

 

Typical Applications

• kW Class Fiber Lasers & Amplifiers

• Materials Processing

• Military, Industrial and Medical

Features & Benefits

• Superior photo-darkening performance in both CW and pulsed applications

• Enhanced reliability for power scaling beyond kW level

• Higher absorption mitigates non-linearities and enables higher peak powers

• NuCOAT-FA-HP – for enhanced coating reliability in industrial environments

• Designed to work with existing matched passive fibers

 

Optical Specifications

LMA-YDF-14/250-HP-XM

1365438

LMA-YDF-20/400-HP-XM

1398875

LMA-YDF-25/250-HP-XM

Operating Wavelength

1015 – 1115 nm

1015 – 1115 nm

1015 – 1115 nm

Core NA

0.070 ± 0.005

0.065 ± 0.005

0.070 ± 0.005

First Cladding NA (5%)

≥ 0.46

≥ 0.46

≥ 0.46

Core Attenuation

≤ 20.0 dB/km @ 1200 nm

≤ 15.0 dB/km @ 1200 nm

≤ 25.0 dB/km @ 1200 nm

Cladding Attenuation

≤ 15.0 dB/km @ 1095 nm

≤ 15.0 dB/km @ 1095 nm

≤ 15.0 dB/km @ 1095 nm

Cladding Absorption

0.80 ± 0.10 dB/m at 915 nm

3.40 dB/m near 976 nm

0.40 ± 0.05 dB/m at 915 nm 2.30 ± 0.30 dB/m at 915 nm

9.90 dB/m near 976 nm

Slope Efficiency

N/A

> 70.0%@ 915 nm

N/A

Geometrical & Mechanical

Specifications

Cladding Diameter (flat-to-flat)

250.0 ± 5.0 µm

400.0 ± 10.0 µm

250.0 ± 5.0 µm

Core Diameter

14.0 ± 1.0 µm

20.0 ± 1.5 µm

25.0 ± 1.5 µm

Coating Diameter

395.0 ± 15.0 µm

550.0 ± 15.0 µm

395.0 ± 15.0 µm

Core/Clad Offset

≤ 1.00 µm

≤ 2.00 µm

≤ 1.5 µm

Coating Material

Low Index Acrylate

Low Index Acrylate

Low Index Acrylate

Prooftest Level

≥ 100 kpsi (0.7 GN/m²)

≥ 100 kpsi (0.7 GN/m²)

≥ 100 kpsi (0.7 GN/m²)