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Large Aperture Attenuator

One laser beam manual attenuator large aperture version made by Altechna

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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Typical Items for Large Aperture Attenuator

Wavelength, nm Bandwidth, nm Configuration Optimization Attenuation range*
(Tmin-Tmax) @ CWL
Product ID
515 ±5 λ/2 ZO waveplate + 2x TFP Reflection 0.3-99% LAT-R-0515
λ/2 ZO waveplate + TFP Transmission 0.5-95% LAT-T-0515
532 ±5 λ/2 ZO waveplate + 2x TFP Reflection 0.3-99% LAT-R-0532
λ/2 ZO waveplate + TFP Transmission 0.5-95% LAT-T-0532
800 ±50 λ/2 Achromatic waveplate +
2x Broadband (Ultrafast) TFP
Reflection contrast 0.1-70% LATU-R2-0800
λ/2 Achromatic waveplate +
2x Broadband (Ultrafast) TFP
Reflection 4-96% LATU-R1-0800
1030 ±10 λ/2 ZO waveplate + 2x Broadband TFP R Reflection 0.3-99% LAT-R-1030
λ/2 ZO waveplate + Broadband TFP Transmission 0.5-95% LAT-T-1030
1064 ±5 λ/2 ZO waveplate + 2x TFP Reflection 0.3-99% LAT-R-1064
λ/2 ZO waveplate + TFP Transmission 0.5-95% LAT-T-1064

Large Aperture Attenuator

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.


  • 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

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.

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