Circular Variable Neutral Density Filters

Material	B-270 optical crown; UV grade Fused Silica
Outside Diameter	25 mm; 50 mm; 100 mm
Inside Diameter	8.3 mm
Desing Wavelength	400-700 nm
Operating wavelength range	380-2000 nm (B-270); 250-2500 nm (UV grade Fused silica)
Coated Area	0 to 270 degree
Parallelism	+/-3 arcmin

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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. A large finite aperture can be attenuated by counter rotating two filters in series. Sizes are available from 25 mm to over 100 mm in diameter.

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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Average transmission in VIS	Operating range	Optical density range	Substrate material	Substrate size, mm	Product ID	Price	Action

90% to 10%	380-2000 nm	0.04 to 1.0	B-270 optical crown	Ø25	1-CNF-1-A025	89 €
90% to 10%	380-2000 nm	0.04 to 1.0	B-270 optical crown	Ø50	1-CNF-1-A050	131 €
90% to 10%	380-2000 nm	0.04 to 1.0	B-270 optical crown	Ø100	1-CNF-1-A100	186 €
90% to 10%	250-2500 nm	0.04 to 1.0	UV grade Fused silica	Ø25	1-CNF-1-B025	99 €
90% to 10%	250-2500 nm	0.04 to 1.0	UV grade Fused silica	Ø50	1-CNF-1-B050	146 €
90% to 10%	250-2500 nm	0.04 to 1.0	UV grade Fused silica	Ø100	1-CNF-1-B100	233 €
90% to 1%	380-2000 nm	0.04 to 2.0	B-270 optical crown	Ø25	1-CNF-2-A025	89 €
90% to 1%	380-2000 nm	0.04 to 2.0	B-270 optical crown	Ø50	1-CNF-2-A050	131 €
90% to 1%	380-2000 nm	0.04 to 2.0	B-270 optical crown	Ø100	1-CNF-2-A100	186 €
90% to 1%	250-2500 nm	0.04 to 2.0	UV grade Fused silica	Ø25	1-CNF-2-B025	99 €
90% to 1%	250-2500 nm	0.04 to 2.0	UV grade Fused silica	Ø50	1-CNF-2-B050	146 €
90% to 1%	250-2500 nm	0.04 to 2.0	UV grade Fused silica	Ø100	1-CNF-2-B100	233 €
90% to 0.1%	380-2000 nm	0.04 to 3.0	B-270 optical crown	Ø25	1-CNF-3-A025	94 €
90% to 0.1%	380-2000 nm	0.04 to 3.0	B-270 optical crown	Ø50	1-CNF-3-A050	141 €
90% to 0.1%	380-2000 nm	0.04 to 3.0	B-270 optical crown	Ø100	1-CNF-3-A100	203 €
90% to 0.1%	250-2500 nm	0.04 to 3.0	UV grade Fused silica	Ø25	1-CNF-3-B025	102 €
90% to 0.1%	250-2500 nm	0.04 to 3.0	UV grade Fused silica	Ø50	1-CNF-3-B050	151 €
90% to 0.1%	250-2500 nm	0.04 to 3.0	UV grade Fused silica	Ø100	1-CNF-3-B100	238 €