Linear Variable Density Filters

Material	B-270, BK7
Dimensions tolerance	±0.2 mm
Parallelism	±3 arc min
Standard Linearity	±5% of end density value
Standard Deviation of Density End Point	±5% of end density value

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Description Metrology

Transmitted intensity varies as a function of the optical density range. The filter can be used for white light as well as for lasers.

Altechna metrology lab applies following product inspection:

Visual inspection – surface quality evaluation according to MIL 13830 and ISO 10110 standards

Dimensions – measurement of geometrical dimensions, as diameter, thickness, etc.

Transmittance (Spectrophotometer, laser)*

Flatness (Interferometer)

Wavefront distortion (Interferometer)

Parallelism (Goniometer, interferometer)

*(…) used equipment

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Laser optics direct from stock. All products are inspected at metrology laboratory, certified and delivered worldwide direct from European Union.