Stepped Neutral Density Filter, Operating Wavelength Band: 240-1200 nm OFS2-30DM
JCOPTIX stepped neutral-density filters have varying-thickness Inconel films over 270° of circular UV fused-silica substrates. Inconel's flat UV-to-near-IR response uniformly attenuates broadband beams. There are 8 or 10 gray levels with abrupt OD changes between them. Rotation adjusts density for variable-attenuation applications or those requiring known OD values. Optical Density (OD) expresses attenuation of incident intensity and relates to transmission T by T=10⁻OD, where T lies between 0 and 1. Higher OD means lower transmission and higher reflection; densities can be added. Slight tilt relative to the beam avoids harmful etalon interference. Face the metal toward incident light to minimize back-reflection: light reflected by the uncoated second surface first passes through metal, greatly attenuating unwanted returns. Standard stepped filters fit MMFR-ND rotation mounts and graduated mounts. Separate filters and premounted versions in both mount types are available for direct use; contact support for other sizes/shapes. The special metal film readily oxidizes after prolonged air exposure or in humid/corrosive-gas environments, impairing performance; filters are consumables. 1. Keep the environment clean/dry before use. 2. Wear gloves; avoid direct surface contact. 3. Avoid scuffs/scratches accelerating oxidation/coating loss. 4. Seal unused filters in supplied protective boxes. Stepped ND filters, UVFS substrate, metal film: 240-1200 nm. Models: OFS2-10, OFS2-30, OFS4-40. Attenuation over 240-2400 nm; OD ranges 0.04-1.0, 0.04-3.0, or 0.04-4.0; unmounted. JCOPTIX deposits varying-thickness Inconel over 270° of circular UV fused silica. There are 8 or 10 gray levels with abrupt OD changes. Rotation adjusts density for variable-density applications or known-OD requirements. Standard filters fit MMFR-ND rotation mounts. Mounted stepped ND filters, UVFS substrate, metal film: 240-1200 nm. Models: OFS2-10M, OFS2-30M, OFS4-40M. Attenuation over 240-2400 nm; OD ranges 0.04-1.0, 0.04-3.0, or 0.04-4.0; installed in MMFR-ND rotation mounts. JCOPTIX deposits varying-thickness Inconel over 270° of circular UV fused silica. There are 8 or 10 gray levels with abrupt OD changes. Rotation adjusts density for variable-density applications or known-OD requirements. Standard filters are premounted in MMFR-ND rotation mounts for direct use. Mounted stepped ND filters with graduated dials, UVFS substrate, metal film: 240-1200 nm. Models: OFS2-10DM, OFS2-30DM, OFS4-40DM. Attenuation over 240-1200 nm; OD ranges 0.04-1.0, 0.04-3.0, or 0.04-4.0; supplied in graduated mounts. JCOPTIX deposits varying-thickness Inconel over 270° of circular UV fused silica. There are 8 or 10 gray levels with abrupt OD changes. Rotation provides fine angular OD adjustment for applications requiring changing and explicitly known optical densities. Standard filters come in graduated mounts for direct use. Mounts have dials and shafts; the graduated side is coated. Face the metal coating toward incident light for optimum performance.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Substrate Material | UV Fused Silica |
| Dimensions | Ø50 mm |
| Thickness | 2.0 mm |
| Clear Aperture Dimension | Ø9.5 mm<Coated Area<Ø47 mm |
| Operating Wavelength Band | 240-1200 nm |
| Optical density (OD) value | 0.04-3.0 |
| Optical Density OD Level | 8 Steps |
| Dimensional Tolerance | Outer Diameter: +0.00/-0.25 mm, Inner Diameter: +0.25/-0.00 mm |
| Thickness Tolerance | +0.0/-0.1 mm |
| Optical density OD tolerance [At Both Extremes] | ± 5% (At Both Extremes) |
| Coating | Chromium-Nickel-Iron Alloy |
| Coating Radial Angle | ± 1° |
| Chamfer [45°] | < 0.2 mm，45° |
| Surface Flatness [@633 nm] | < λ |
| Surface parallelism | < 3 arcmin |
| Surface quality (scratch/dig) | 60/40 |
| Mechanical housing dimensions | 63.5 mm |
| Bottom Threaded Hole | M4 |
Key Features
Datasheet
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