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).Features
- 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
Specification
| 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 |
| Transmission Deviation From Nominal (%) | ||||
|---|---|---|---|---|
| Optical Density | Nominal Transmission (%) | 250-350 nm | 350-800 nm | 800-2000 nm |
| 0.10 0.15 0.20 | 79.5 70.8 63.0 | ±9.0 ±8.0 ±6.0 | ±3.0 | ±9.0 |
| 0.30 0.40 0.50 | 50.0 39.1 31.6 | ±5.0 ±4.0 ±4.0 | ±2.0 ±1.5 ±1.5 | ±5.0 ±4.0 ±4.0 |
| 0.60 0.70 0.80 | 25.0 20.0 15.5 | ± 4.0 | ± 1,5 | ± 4.0 ± 4.0 ± 4.0 |
| 0.90 1.00 1.30 | 12.6 10.0 5.0 | ± 3.5 ± 3.5 ± 3.0 | ± 1.0 ± 1.0 ± 1.0 | ± 3.5 ± 3.5 ± 3.0 |
| 1.50 2.00 2.50 | 3.2 1.0 0.32 | ± 1.5 ± 0.5 ± 0.15 | ± 0.5 ± 0.2 ± 0.07 | ± 1.5 ± 0.5 ± 0.15 |
| 3.00 4.00 | 0.10 0.01 | ± 0.06 ± 0.01 | ± 0.05 +0.01/-0.008 | ±0.1(nominal) ±0.01(nominal) |
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 |
| 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 |
Applications
Calibration
Attenuation
Low-Power Lasers
Scientific Measurements and Research
Machine Vision and other imaging applications
Contact
Product Manager
| +39 06 5004204 | |
| +39 06 5010389 | |
| renzi@qd-europe.com |
Ing.
Fabrizio
Renzi
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Quantum Design s.r.l.
Via Francesco Sapori, 27
00143 Roma
Italy
| Phone: | +39 06 5004204 |
| Fax: | +39 06 5010389 |
| E-mail: | italy@qd-europe.com |