Reflective Neutral Density Filter Unmounted (UV) 20mm Diameter 70％

FNDU-20C02-70

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The reflective ND filter is used for high power and broadband wavelength light density reducing. The untransmitted light would not be absorbed, there is no possibility of glass damaging by the heat.

Details

◦The metal reflection coating provides an extremely smooth transmission characteristic from the UV to IR wavelengths.
◦We are using synthetic fused silica substrates for high transmission at UV range for the UV ND filter. We can obtain almost the similar transmittance at the Near UV and the visible range.
◦The substrate thickness is 2mm +/−0.1mm with no difference with the transmittance.

More Information

More Information
Name	Reflective Neutral Density Filter Unmounted (UV) 20mm Diameter 70％
Weight	0.0050lbs
Standard Coatings Available	No
Guide	Different size, wavelength and deviation not mentioned on-line or in our catalog are available as custom product upon on request.
Remark	-
Attention	Chrome coating is an absorptive material and can not be used with high power pulsed laser. The thermal lens effect may happen on filter with high power laser, for high power laser or high energy laser, please use our variable beamsplitter (model VBS). WEB Reference Catalog Code/W3022 The reflected light off of the filter is dangerous for eyes, please make sure a non-reflective material at the edge end of the light. A vertical light into the filter may have feedback light back into the laser source, it may make an instability to the laser oscillator. To avoid this phenomenon please incline the filter at a small angle. The filter with 92% transmittance rate (model FND-92 and others) is non-coated on both surface. The reflectance is about 4% on each surface, and so, 8% total loss.
Image Label	Reflective Neutral Density Filter Unmounted (UV) 20mm Diameter 70％
Diameter φD	20mm
Transmittance	70% (300nm)
Type	Ultraviolet (UV)
Material	Synthetic fused silica
Coating	Chrome coating (Cr) but FNDU-92, MFNDU-92 is no coated
Wavelength Range	200 − 400nm
Parallelism	＜30″
Surface flatness	λ (Measurement area: φ30mm)
Surface Quality (Scratch-Dig)	60-40
Clear aperture	90% of the diameter
Diameter φD	φ20mm
Transmittance (300nm)	0.7
Availability	Please contact

In stock

SKU

FNDU-20C02-70

SGD 104.30

The reflective ND filter is used for high power and broadband wavelength light density reducing. The untransmitted light would not be absorbed, there is no possibility of glass damaging by the heat.

Reflective Neutral Density Filter Unmounted (UV) 20mm Diameter 70％

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