General Description
Models
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Our compensated attenuator provides high resolution intensity control without introducing a gradient in the intensity distribution or a change in the beam propagation direction. The optical density can be varied from 0.16 to 3.0 through a top-mounted adjustment knob.
Attenuation is achieved by moving two matched BK 7 wedged filters in opposing directions. The filters have a linear-variable aluminum neutral density coating and a broadband antireflection coating (Model 31W00MP-ML.1, see Linear Variable Metallic Neutral Density Filters). The slight wedge in the filters displaces any secondary reflections off-axis. The filters are matched for minimal beam deviation. |
Specifications |
| Aperture Diameter |
12.7 mm |
| Attenuation Range |
0.16–3.0 optical density |
| Reflected Beam Deviation |
<20 arc sec (typical) |
| Wavelength Range |
440–690 nm optimal
400–1500 nm with reduced maximum transmission |
| Damage Threshold |
75 W/cm2 CW, 10 mJ/cm2 with 10 nsec pulses at 1064 nm, typical; not recommended for high energy pulsed laser use |
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