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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