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Rectangular Continuously Variable Metallic Neutral Density Filter
商品货号:ECS000768
商品品牌:Thorlabs
详细介绍
  • Ideal for use in building a variable attenuator
  • Two sizes for free space or fiber use

Thorlabs Rectangular Continuously Variable, Metallic Neutral Density (ND) Filters are ideal for mounting on a translation stage for use as a variable attenuator. Two different versions are offered in both the 10 mm and 25 mm height size that go from 0.04 (uncoated material) to 2.0 or from 0.04 to 4.0 optical density.

The optical density, D, is defined by the following equation


D = log10 (1/T), or T = 10-D

A higher optical density, D, will translate to lower transmission and greater reflection of the incident light. For higher transmission and less reflection, a lower optical density, D, would be appropriate. For lab safety, Thorlabs offers an extensive line of safety and blackout products that significantly reduces exposure to stray or reflected light.

Our rectangular step variable ND filters have a UV Fused Silica glass substrate and are metal (Inconel) coated. The Inconel film is a very hard metallic alloy that is resistant to aging under normal conditions. The Inconel coating will oxidize at elevated temperatures; it is recommended that the Neutral Density filters be used at temperatures below 100oC. The use of an Inconel coating ensures that the spectral response of these ND filters is very flat from the UV out to the Mid-IR.

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