Ytterbium doped double clad fibers

Ytterbium doped double clad fibers

Our ytterbium-doped double-clad fibers offer the largest single-mode cores in the world. The high numerical aperture for the pump core/inner cladding lets you pump with high efficiency, even with inexpensive or high-power broad area emitting pumps.

The single-mode signal travels in the large mode area to give high power levels and prevents nonlinearities.

Key Features

Slice 1

Single-mode with large mode area

Handles high pulse energy

High NA circular pump core

Slice 1

High pump absorption, no skew-rays

Excellent power handling

High reliability

Available models


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Double clad ytterbium fibers made with photonic crystal fiber technology are known as air-clad fibers and provide a range of new benefits: The extremely high numerical aperture (NA) for the pump core/inner cladding is possible, allowing efficient pumping with inexpensive/high power broad area emitting pumps.

The large mode area for the single-mode signal facilitates high power levels while avoiding nonlinearities and providing a good overlap between the pump guide and the signal guide area (= high pump absorption, high efficiency).

The fibers have efficient mode and ray scrambling even for circular pump cores and the all-glass design has a much higher damage threshold than standard double-clad fibers.

The Single-Mode Advantage

All our fibers are single-mode leading to several advantages compared to standard multimode LMA fibers:

  • Better output stability
  • Excellent beam quality
  • No need for tight coiling
  • No coiling-induced mode area compression

See also our white paper on DC-200/40-PZ-Yb modal properties

The output of the ytterbium-doped DC-200/40-PZ-Yb fiber from NKT Photonics where the 1064 nm seed laser (≈6 µm spot size) launch position is scanned across the input facet of the fiber. Only the fundamental mode (LP01) is present in the output beam.

When the input launch position is changed the mode profile is maintained but with reduced power. This demonstrates the single-mode property of the DC-200/40-PZ-Yb.

Want more details?

If you want more details about how to handle optical fibers: Strip, cleave, and couple them, we have some application notes for you.


Choose model:
Mode properties
Cut-off [nm]
≤ 1000
Beam quality, typical @1064 nm
M2 ≤ 1.3
M2 ≤ 1.3
Mode-field diameter, 1/e2 @1064 nm
15 ± 1 µm
31 ± 2 µm
Pump absorption @ 915 nm
2.30 ± 0.35 dB/m
3.75 ± 0.75 dB/m
Pump absorption @ 976 nm, typical
≈7 dB/m
≈10 dB/m
Birefringence Δn @ 1100 nm, typical
≥ 1 x 10-4
≥ 1 x 10-4
PER, typical @ 1064 nm
≥ 15 dB
≥ 15 dB
Signal core diameter
≈14 µm
≈40 µm
Pump cladding diameter
135 ± 3 µm
200 ± 3 µm
Outer cladding diameter
275 ± 8 µm
450 ± 20 µm
Coating diameter
360 ± 15 µm
540 ± 30 µm
Coating material, single-layer
High-temperature acrylate
High-temperature acrylate
Outer and pump cladding material
Pure silica
Pure silica