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High power attenuator for either pulsed or continuous (cw) laser beams
Diffractive Variable Laser Beam Attenuators

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Overview

Diffractive attenuators control the power of laser radiation using diffraction gratings. Since phase diffraction gratings do not absorb light they can be used to attenuate also high-power laser radiation (cw, pulsed). Variation of grating parameters along the attenuator results in variable transmission at a given wavelength. Diffractive attenuators can be designed for deep UV till IR.

Specifications

Diffractive Variable Attenuator (DVA)

Substrate material UV grade fused silica
Surface flatness λ/4@532 nm
Wedge <30 arcsec
Diameter diameter:Φ60 mm、thickness:3 mm
Clear aperture 14 mm (12 mm with tubes)
Transmission range >2 %~96 % (deviation from linearity:<5 %
AR coating(back side) R(effective for design wavelength)<0.3 %
Damage threshold >500 W/cm2@CW
>3 J/cm2@10 ns
>1J/cm2@150 fs(800 nm/1 kHz)
Design wavelength DVA1064:(355 nm also available)
DVA0800:800 nm (266 nm/248 nm also available)
DVA0532:532 nm
DVA0355:35 nm
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