FastFBR Yb doped fibers for pulsed lasers

Our polarization-maintaining ytterbium doped optical fibers are designed to deliver outstanding beam quality, making them ideal for pulsed laser applications. 


All our fibers are based on a low photodarkening chemical process with an index profile designed to ensure excellent beam quality. Built around our patented depressed-clad design, our Yb-doped large mode area (LMA) fibers are ideal choices for achieving high-power amplification with outstanding beam quality.

We offer a wide range of Yb-doped optical fibers. We can also provide custom fiber tailor made to your specifications and requirements.

Tapered fiber

The Yb-MCOF-35/250-56/400-07-2.5-T0.8-PM is a tapered fiber designed for an output M² lower than 1.2, making it the perfect choice for applications requiring superior beam quality. It features a confined core for selective gain amplification of the fundamental mode, and a patented depressed-cladding design for enhanced suppression of higher order modes.


  • Designed for output M² lower than 1.2
  • Effective mode area: 1000 µm2
  • Low photodarkening
  • Polarization-maintaining fiber
  • Depressed cladding for enhanced higher-order mode filtering
  • Confined core for selective amplification of the fundamental mode

Available specialty fibers

Available fibers with their characteristics are shown below. Click on the name of the fiber for a complete list of specifications.

Main specifications

Tapered fiber 2.5dB/m Tapered fiber 2.2dB/m Yb401-PM Yb-MCOF-10/125-08-1.6-PM Yb-DCOF-15/125-08-2.7-PM Yb-MCOF-35/250-07-0.9-PM Yb-MCOF-35/250-07-2.5-PM Yb-MCOF-35/250-05-2.0-PM
Optical cladding Multiple Mutilple Single Multiple Double Multiple Multiple Multiple
Core diameter 35/56 µm 35/56 µm 5 µm 10 µm 15 µm 35 µm 35 µm 35 µm
Cladding diameter 250/400 µm 250/400 µm 125 µm 125 125 µm 250 µm 250 µm 250 µm
Core NA 0.07 0.07 0.14 0.08 µm 0.08 0.07 0.07 0.05
Absorption at 915 nm 2.5 dB/m 2.2 dB/m 140 dB/m 1.6 dB/m 2.7 dB/m 0.9 dB/m 2.5 dB/m 2.0 dB/m
Price per meter, 1 to 9 m N.D N.D $US 250 $US 200 $US 420 $US 425 $US 550 $US 550

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