Metallic neutral density filters
Metallic-coated neutral density (ND) filters obtain their optical density from a metal alloy coating on a substrate determined by the wavelength region of interest. Unlike the all-dielectric or absorption type, the metallic type ND filter employs a combination of absorption and reflection to reduce the intensity of light. While able to withstand more incident energy than the absorptive type, metallic ND filters are suitable only for low-power applications. (Note: If used in series, these filters should be tilted to avoid multiple reflections and any reduction of density).
- Provides attenuation with greater linearity over a wide spectral range
- Reduces thermal effects in low-power laser applications
- Delivers superior durability
- Soda lime glass, fused silica and custom substrates available
Specifications
| General Specifications | |
|---|---|
| Thickness | 1.5±0.5 mm |
| Dimensional Tolerances | +0/-0.2 mm |
| Clear Aperature | 90% of outside dimension |
| Surface Quality | 60/40 per MIL-0-13830B |
| Coating Adherence | Per MIL-M-13508C |
| Humidity | Per MIL-STD-810F |
| Max. Operating Temperature | +100 °C |
| Substrate Materials | Glass (350-2000 nm region) or fused silica (250-2000 nm region) |
| Optical Quality | Glass: Flatness of 3-5 waves per inch and parallelism of 3 arc minutes or better Fused Silica: Flatness of λ/4 per inch and parallelism of 30 arc seconds or better |
| Mechanical | Unmounted |
| Optional | Mountec in threaded ring - for Threaded Ring Sizes ask our expert on the right |
Metallic Neutral Density Specifications
Visible/Near Infrared Region (Glass Substrate, 350-2000 nm, available in Ø12.5, 25 and 50 mm and 50 mm SQ)
| Optical Density | Nominal Transmission (%) | Part Number |
|---|---|---|
| 0.10 0.15 0.20 | 79.43 70.79 63.10 | 010FN52 015FN52 020FN52 |
| 0.30 | 50.12 39.81 31.62 | 030FN52 040FN52 050FN52 |
| 0.60 0.70 0.80 | 25.12 19.95 15.85 | 060FN52 070FN52 080FN52 |
| 0.90 1.00 1.30 | 12.59 10.00 5.01 | 090FN52 100FN52 130FN52 |
| 1.50 2.00 2.50 | 3.16 1.00 0.32 | 150FN52 200FN52 250FN52 |
| 3.00 4.00 | 0.10 0.01 | 300FN52 400FN52 |
Ultraviolet/Visible/Near Infrared Region (Fused Silica, 250-2000 nm, available in Ø12.5, 25 and 50 mm and 50 mm SQ)
| Optical Density | Nominal Transmission (%) | Part Number |
|---|---|---|
| 0.10 0.15 0.20 | 79.43 70.79 63.10 | 010FN46 015FN46 020FN46 |
| 0.30 0.40 0.50 | 50.12 39.81 31.62 | 030FN46 040FN46 050FN46 |
| 0.60 0.70 0.80 | 25.12 19.95 15.85 | 060FN46 070FN46 070FN46 |
| 0.90 1.00 1.30 | 12.59 10.00 5.01 | 090FN46 100FN46 130FN46 |
| 1.50 2.00 2.50 | 3.16 1.00 0.32 | 150FN46 200FN46 250FN46 |
| 3.00 4.00 | 0.10 0.01 | 300FN46 400FN46 |
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Quantum Design GmbH
Roddarestigen 3
SE 182 35 Danderyd
Sweden
| Phone: | +46 8 41071791 |
| E-mail: | nordicqd-europe.com |
