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| Coad | 669944 | Substrate | UVFS | |
| Type | Neutral Density Filter | OD | 0.04-4.0±5％@=0.5,1.0,2.0,3.0,4.0±10％@=0.1,0.2,0.3,0.4（10thorder） | |
| Diameter(mm) | 100.00 | Diameter Tolerance | - | |
| Clear Aperture | 9.5mm| | Parallelism |
<3 arcmin |
|
| Thickness(mm) | 2.00 | Thickness Tolerance | - | |
| Surface Quality | 60-40 | Wavelength(nm) | 240 - 1200 | |
| Surface Flatness | λ@633nm | FWHM | - | |
| Transmittance | - | Mechanical Housing | - | |
| Shell Diameter | 114.3mm | Housing Diameter Tolerance | - | |
| Outer Shell Thickness | - | Operating Temperature | - | |
| Laser Damage Threshold | - | Transmission Wavefront Deviation | - | |
| Coating Radial Angle | 297.0°±5° | Coating Type | Chromium-Nickel-Iron Alloy Coating | |
| Protective Chamfer | <0.2mm，4.05° | AOI | - | |
| Coating Specifications | - | |||
LBTEK step neutral density filters are made of UV-grade fused silica substrates with a metallic (chromium-nickel-iron alloy) coating, designed for a transmission wavelength range of 240–1200 nm. The optical density (OD) range is 0.04–1.0, 0.04–3.0, or 0.04–4.0, providing 8 or 10 discrete OD steps by rotation. Available sizes are Ø50 mm and Ø100 mm. Depending on the size, the coating radial angle is either 297.5° ± 5.0° or 297.0° ± 5.0°.
The mounted LBTEK step neutral density filters feature housings with angular scales and a rotation axis. The mounts are precisely engineered to minimize the impact on the clear aperture of the optical element, with a compact design that makes them an excellent alternative to filter wheels. The side with the scale is the coated surface, and for optimal performance, it is recommended that light enter from this side.
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