aeroGAIN-ROD high power ytterbium rod fiber gain modules

The aeroGAIN-ROD module is the ultimate in fiber amplification for pulsed lasers with a power handling previously only available in solid-state configurations. With a 3300 µm2 mode field area and high pump absorption, the aeroGAIN-ROD module offers up to ten times the performance of our aeroGAIN-FLEX and -BASE models.

The excellent mode quality and easy coupling make the aeroGAIN-ROD module an ideal gain medium for high-power amplifiers. The rugged aluminum body makes the module easy to handle and mount for both OEM integration and scientific laboratory setups. Integrated water cooling with quick coupling ensures efficient thermal management and a long maintenance-free lifetime of thousands of hours. The pump light is guided by our proven air clad technology, with high reliability, high damage threshold, and large NA. The modules come standard with high-power AR-coated end-caps.


  • ­ Diffraction limited beam quality
  • ­ High peak power damage threshold
  • ­ Compact format
  • ­ High NA pump cladding
  • ­ AR coated end-caps
  • ­ Optimized for 1030-1040nm range
  • ­ Supports PM and non-PM amplification


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The aeroGAIN-ROD modules are available in two configurations.

Model Signal core diameter Mode field diameter (1/e2 @ 25%0 nm) Pump cladding diameter
1.1 ~55 µm 45 µm ± 4 µm 200 µm ± 10 µm
2.1 ~85 µm 65 µm ± 5 µm 260 µm ± 15 µm
Signal wavelength 1030-1040 nm
Pump cladding NA (FWHM@950 nm) ≥ 0.50
Gain fiber length 804 mm ±  3 mm
Cladding absorption@915 nm 5 dB ± 0.5 dB
Cladding absorption@976 nm ~15 dB (nominal)
Typical PER* ≥15 dB
Typical optical efficiency* ≥60%
Typical M2 ≤ 1.3
End-cap dimensions (DxL) 6X5 mm
End-cap coating R@ 1030 nm ≤ 0.2%
End-cap coating R@ 976 nm ≤ 0.3 %
End-cap angle, input ≤ 0.5°
End-cap angle, output 2° ± 0.5°
Signal average power ≤ 100 W
Dimensions (WxLxH) 35x817x35.2 mm
Weight 2.5 kg
Water cooling connection 8 mm x 1/4” BSPP
Recommended water flow** >2 L/min
Recommended water temperature** 25°C
Operating temperature 20-30°C (ambient)
Storage temperature -20°C - +60°C

*Seed level 5 W @ 1030 nm, 80 cm rod length, 976 nm pumping
**We recommend using DI water containing an anticorrosive additive to protect the aluminum cooling circuit. Required
water flow and water temperature depends on the actual optical system parameters

Real single-mode amplification

The aeroGAIN-ROD modules offer true single-mode amplifications at power levels previously reserved for multimode systems. True single-mode amplifications has a range of advantages compared to multimode systems:

  • Better output stability
  • Excellent beam quality
  • No need for tight coiling
In the video below is shown the output of an aeroGAIN-ROD-PM85 where the 1040 nm seed laser input is scanned across the input facet of the rod. The area in the white ring is the core. Note how the light is coupled to the cladding when the input is scanned but the mode quality of the ytterbium core stays the same. The fiber is not pumped in this example.