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Neutral Density Filters                                    


GCC-30 Neutral Density Filters

Near flat transmittance from VIS to IR
OD available from 0.1 to 3.0

GCC-3010 Neutral Density Filters
GCC-3020  Metallic Linearly Variable Neutral Density Filter 
GCC-3030  Metallic Circularly Variable Neutral Density Filter

 

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.

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  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.

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  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.


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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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