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VND-50U
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The VND is a reflective ND filter. The reflectivity and the transmittance vary by rotation. They are used mainly for light intensity adjustment in vision or illumination experiments.

◦Possible to adjust the intensity by rotation continuously or select light intensity position.
◦The transmittance light can be adjusted logarithmically, it makes dynamic light intensity adjustment possible.
◦Thin and space saving, it is easy to be placed in a narrow optical test set up.
◦The VND-U model is adaptable for use at Ultraviolet bandwidth made of fused silica.

Guide

▶For AOI (Angle of Incident) changing, the transmittance can be also changed. We recommend to use with the VBS, Variable Beam Splitter.
W3022
▶Please refer to here for Wavelength Characteristic Data (Reference Data, EXCEL file format).

Attention

▶The round shape variable ND filter is very fragile. The bore is made of glass. Do not force on one surface of the bore when fixed in a holder, it could be broken. For a compatible ND filter holder (NDHN) for your optics replacement on to the holder, please contact our Sales Division for assistance.
▶The Chromium film coating is absorptive, please avoid to use with high power laser.
▶High power laser light can have thermal lens effects, please use (VBS) Variable Beam Splitter for high power and high energy laser applications.
W3022
▶The reflected laser light beam is dangerous for eyes, the user must be aware and be prepared to use unreflective tools at the end of the laser beam.
▶The normal incident of the laser beam may produce optical feedback, to avoid this situation please use it with a small incident angle.
▶Incident light with large beam onto the Variable ND can produce a laser strength inside of the beam. Use incident light to the filter with a narrow beam.

Outline Drawing

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Optical Density (Reference data)

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OD: Optical density
Schematic

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Products

Part Number

JP Yen

Stock

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VND-50U

RoHS  

¥80,000

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Common Specifications
ShapeCircleRectangle
MaterialVND: BK7 VND-U: Synthetic fused silicaSoda Lime Glass
CoatingChrome (Cr)Chrome (Cr)
Wavelength RangeVND:400 - 2000nm VND-U:200 - 2000nm400 - 700nm
Transmittance0.1 − 92%1 − 92%
Surface flatnessλ (Measurement area: φ30mm)Both side: slippery surface (no polishing)
Parallelism<1′
Surface Quality (Scratch-Dig)60-4080−50
Specifications

φD1

φ50mm

φD2

φ15mm

Thickness t

2mm

Wavelength Range

200 − 2000nm

Documents/Downloads

Part Number

Catalog PDF

dxf

STP

IGS

SAT

Zemax

VND-50U

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