Variable Attenuator for Femtosecond Laser Pulses 990-0072

  • Divides laser beam into  two beams of manually adjustable intensity ratio separated by 68° angle
  • Large dynamic range
  • Transmitted beam shift ~1 mm
  • High optical damage threshold


This variable attenuator/beamsplitter consists of UV FS Thin Film Brewster Type Polarizer diameter 50.8 mm, which reflect s-polarized light while transmitting p-polarized light, that is housed into Beamsplitter Mount 840-0056-12 and a quartz Zero Order (optically contacted) Half Waveplate diameter 25.4 mm (for femtosecond applications) or Zero-Order Air-Spaced Half Waveplate (for high power applications) housed in rotating Polarizer Holder 840-0190, placed in the incident linearly polarized laser beam.


The intensity ratio of those two separated and different polarized beams may be continuously varied without alteration of other beam parameters by rotating the waveplate. The intensity of either exit beam, or their intensity ratio, can be controlled over a wide dynamic range. P-polarization could be selected for maximum transmission, or high-purity s-polarization could be reflected when maximum attenuation of the transmitted beam takes place.


840-0056-12 Kinematic Mount allows to adjust angle of incidence (AOI) of the thin film Brewster type polarizers by ±4.5° and to get the maximum extinction contrast. The mounts are on rods, rod holders and movable base 820-0090.


The optical axis height from the table top can be adjusten in the range of 78-88 mm. Other height can be offered as custom changing the standard rods and rod holders into higher.


Estimated delivery time: Request

Wavelength, nm

For Femtosecond Laser Pulses

Code Wavelength, nm Price Delivery Add to cart
990-0072-266 266 1045 $ Request To cart
990-0072-343 343 985 $ Request To cart
990-0072-400 400 952 $ Request To cart
990-0072-515 515 952 $ Request To cart
990-0072-800 800 968 $ Request To cart
990-0072-800B 780-820 1078 $ Request To cart
990-0072-1030 1030 979 $ Request To cart
990-0072-1030B 1010-1050 1078 $ Request To cart

A quartz zero order (optically contacted) half waveplate diameter 25.4 mm is housed in rotating holder 840-0180-A2

For High Power Laser Applications

Code Wavelength, nm Price Delivery Add to cart
990-072-266H 266 1194 $ Request To cart
990-0072-343H 343 1133 $ Request To cart
990-0072-400H 400 1100 $ Request To cart
990-0072-515H 515 1100 $ Request To cart
990-0072-800H 800 1117 $ Request To cart
990-0072-800HB 780-820 1227 $ Request To cart
990-0072-1030H 1030 1128 $ Request To cart
990-0072-1030HB 1010-1050 1227 $ Request To cart

A quartz zero order air spaced half waveplate clear aperture diameter 22 mm is housed in rotating holder 840-0180-A2.

Aperture diameter 22 mm
Damage threshold
            for high power laser applications:
>10 mJ/cm2, 50 fs pulse at 800 nm, typical
>100 mJ/cm2, 50 fs pulse at 800 nm, typical
Time dispersion t<4 fs for 100 fs Ti:Sapphire laser pulses
Polarization Contrast >1:200
Eksma Optics is a member of: Paysera
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