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Neutral Density Filters
GCC-30 Neutral Density Filters
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Near flat transmittance from VIS to IR
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OD available from 0.1 to 3.0
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GCC-3010 Neutral Density Filters
The metallic coatings on one side of the filter provide a nearly constant amount of transmitted energy over a wide visible and near infrared waveband. The second polished side is broadband AR coated with R<0.5%. Our neutral density filters are spectrally neutral from about 400nm to 1200nm. On BK7 or quartz substrates, we produce a variety of standard neutral density films with optical densities (OD) including 0.1, 0.3, 0.5, 1.0, 2.0, and 3.0. The coating can be specially designed to fit most transmission requirements. We do not recommend this type of coating to be used with high power lasers due to the absorptive properties of the metallic materials. Power levels less than 30 W/cm2 are advised.
| Material: |
Optical glass |
| Dimension: |
±0.20mm |
| Thickness: |
2 ±0.10mm |
| Wedge: |
<3 arc minute |
| Surface Flatness: |
1λ per inch |
| Surface Quality: |
60-40 scratch-dig |
| Clear Aperture: |
90% dimension |
| Damage Threshold: |
30W/cm2 CW, typical |
GCC-3010 Neutral Density Filters
| Catalog No. |
Density (550nm) |
Transmittance % |
Size |
| GCC-301001 |
0.045 |
90 |
Dia. 25.4 |
| GCC-301002 |
0.045 |
90 |
50x50 |
| GCC-301011 |
0.1 |
79 |
Dia. 25.4 |
| GCC-301012 |
0.1 |
79 |
50x50 |
| GCC-301021 |
0.3 |
50 |
Dia. 25.4 |
| GCC-301022 |
0.3 |
50 |
50x50 |
| GCC-301031 |
0.5 |
32 |
Dia. 25.4 |
| GCC-301032 |
0.5 |
32 |
50x50 |
| GCC-301041 |
1.0 |
10 |
Dia. 25.4 |
| GCC-301042 |
1.0 |
10 |
50x50 |
| GCC-301051 |
1.5 |
3.2 |
Dia. 25.4 |
| GCC-301052 |
1.5 |
3.2 |
50x50 |
| GCC-301061 |
2.0 |
1.0 |
Dia. 25.4 |
| GCC-301062 |
2.0 |
1.0 |
50x50 |
| GCC-301071 |
3.0 |
0.1 |
Dia. 25.4 |
| GCC-301072 |
3.0 |
0.1 |
50x50 |
GCC-3020 Metallic Linearly Variable Neutral Density Filters
These ND filters provide linearly varying attenuation or beamsplitting in the visible and near infrared region. The optical density varies linearly across the length. Attenuation is achieved by a thin film of Ni-Cr-Fe protected with an overcoat of SiO. The rear surface is broadband AR coated for the visible region.
Material: BK7 grade A, fine annealed or UV grade fused silica
Dimension: ±0.2mm
Clear Aperture: >90% of length and 80% of width
Optical Density(OD):0.08-2.0 ±5% at 632.8nm
Linearity of Density:OD ±5%
Coating: S1: Ni-Cr-Fe
S2: Brodband AR coated, Rave<0.5% for 430-700nm at 0-15° |
GCC-3020 Metallic Linearly Variable Neutral Density Filters
| Catalog No. |
Length |
Width |
Thickness |
| GCC-302001 |
76.2 |
25.4 |
2.0 |
GCC-3030 Metallic Circularly Variable Neutral Density Filters
Circularly variable neutral density filters are designed to simplify attenuation and beamsplitting from VIS to near IR. The optical density gradually varies around a 270° circle for convenient attenuation adjustment by simply rotating the filter. Attenuation is achieved by a thin Ni-Cr-Fe film, allowing these attenuators to withstand moderate laser energy as well as to act as variable beamsplitters. A broadband AR visible coating on all nonmetallized areas minimizes losses and avoids ghost images.
Circularly variable ND filters are available with BK7 substrates for general laboratory use, or with UV fused silica substrates for maximum thermal stability. Although the coatings are optimized for 450-700nm, they will operate from 400-1100nm with only minor losses.
| Material: |
BK7 grade A, fine annealed or UV grade fused silica |
| Outside Diameter: |
50 ±0.25mm |
| Inside Diameter: |
8 ±0.25mm |
| Thickness: |
1.5 ±0.20mm |
| Clear Aperture: |
>80% of diameter |
| Linearity of Density: |
OD ±5% at 632.8nm |
| Coating: |
S1: Ni-Cr-Fe |
| S2: Brodband AR coated, |
| Rave<0.5% for 430-700nm at 0-15° |
| Damage Threshold: |
30W/cm2 CW, 10 mJ/cm2 with 10 nsec pulses at the specified wavelength range |
GCC-3030 Metallic Circularly Variable Neutral Density Filters
| Catalog No. |
Relative Density Range |
| GCC-303001 |
0.0-1.0 |
| GCC-303002 |
0.0-1.5 |
| GCC-303003 |
0.0-2.0 |
| GCC-303004 |
0.0-3.0 |
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