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Large Aperture Attenuator

Large Aperture Attenuator

Clear aperture

30 mm


Up to ±50 nm


Reflection or transmission type

Attenuation range (Tmin-Tmax) @ CWL

0.3-99% or 0.1-70% or 4-96%

Typical applications

High power and ultrafast lasers

Damage threshold

>5 J/cm² @ 1064 nm, 10 ns, 10 Hz, >100 mJ/cm² @ 800 nm, 100 fs, 1 kHz

Dimensions (L x W x H)

299 x 135 x 70 mm – ultrafast reflection type, 147 x 136 x 60 mm – transmission type


λ/2 ZO waveplate + 1x or 2x Thin Film polarizers, λ/2 Achromatic waveplate + 2x Broadband (Ultrafast) Thin Film polarizers

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The main feature of Large Aperture Attenuators is larger than 30 mm diameter clear aperture. These incorporate a rotating λ/2 phase waveplate and one or two Thin Film Polarizers that separate s-polarized and p-polarized beams in parallel directions. The polarizers are housed in a specially designed optomechanical holder which is mounted together with a precision waveplate holder. Pure p-polarization should be selected for maximum transmission and pure s-polarization for maximum attenuation. The intensity ratio of the separated beams is continuously tuned by rotating the waveplate in the holder.

Custom wavelengths are available upon request.

Contact us and we will find a solution for your beam attenuation, power control and beamsplitting needs. We can also recommend compatible optical components for your beam delivery applications.


  • Large input aperture
  • Easy operated manual design
  • Ideal for femtosecond and high power laser applications
  • Two parallel p-pol and s-pol output beams
  • Interchangeable optics

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