Description

Neutral density (ND) filters are often used in imaging or laser applications to avoid damage to camera sensors or other optics caused by bright light.

ND filters absorb or reflect the untransmitted part of the light to uniformly reduce the transmittance of a part of the spectrum. Reflective neutral density filter, using the principle of thin film interference, will part of the light through, and the other part of the light reflected. Absorption neutral density filters generally refer to the material itself or after some elements are mixed in the material, the absorption of some specific wavelengths of light, while the other wavelengths of light do not occur or have little impact. Usually the damage threshold of the absorption neutral density filter is lower, and after a long time of use, there may be fever.

· Linearly Variable Neutral Density Filter

Description

Linear variable neutral density filter is used to attenuate light as the filter is shifted. The filter can be used for white light as well as for lasers. A large finite aperture can be attenuated by translating two filters in opposite derections.

Products

● Material:K9/B270
● Parallelism：3 ´
● standard linearity：±5%
● standard deviation of density end point：±5%
● surface quality：80-50
● coated area：More than 80% clear apture
● design wavelength：380-2000nm(B270)/ 250-2500nm(fused silica)
● calibrated wavelength：550nm

· Circulary Variable Neutral Density Filter

Description

Circular variable neutral density filter can linearly attenuate light as the filter is rotated. 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.

Products

● Material:K9
● Coated area: 0°-270°
● Surface Quality: 80-50
● Outside diameter: 25mm、50mm、60mm、100mm
● nside diameter: 7.5mm、8.0mm、8.3mm
● Thickness: 2mm±0.05mm
● Design wavelength: 380-2000nm(B270)/ 250-2500nm(fused silica)
● Relative density range：0-1.0，0-1.5，0-2.0，0-3.0