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400-1100nm Optical Glass Filters N-BK7 Reflective Neutral Density Filter

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400-1100nm Optical Glass Filters N-BK7 Reflective Neutral Density Filter

Name: 4001100nm Optical Glass Filters NBK7 Reflective Neutral Density Filter
Brand: STAR OPTIC
Price: 1 USD

Brand Name : STAR OPTIC

Model Number : NDF-R

Certification : RoHS, ISO9001

Place of Origin : Wuhan, China

MOQ : Negotiable

Price : Negotiable

Payment Terms : T/T, Western Union, Paypal

Supply Ability : 50000pcs/Month

Delivery Time : Negotiable

Packaging Details : Safe and dust-free packing

Product Name : Reflective Neutral Density (ND) Filter

Wavelength : 400-1100nm

Coating material : Inconel coating

Applications : low-power

Substrate : N-BK7, UVFS

Diameter : 25.4mm

Optical Density : 0.1~4.0

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Reflective Neutral Density (ND) Filter

Overview:

Reflective Neutral Density (ND) Filters provide uniform attenuation over the broad spectral range from 400 to 1100 nm.

Reflective ND filters consist of an N-BK7 glass or UV fused silica substrate with a metal (Inconel) coating deposited on one side. Inconel is a metallic alloy that ensures flat spectral response from the UV to the near IR. To prolong the lifetime of reflective ND filters, we recommend using non-contact cleaning methods (such as compressed air) to prevent damage to the coating and avoiding the use of these filters in humid environments to prevent oxidation.

Although these are reflective ND filters, the Inconel coating does absorb some of the incident light, which limits the use of these filters to low-power applications.

To achieve the best performance, light should be incident on the side with the Inconel coating, this allows attenuation to occur before etalon effects occur within the filter's substrate.

General Specifications Of Reflective Neutral Density (ND) Filter:

Material	BK7, UV Fused Silica
Dimension Tolerance	+0.0/-0.2mm
Thickness Tolerance	±0.2mm
Surface Quality	80/50 scratch and dig
Clear Aperture	>90%
Flatness	<2λ@632.8nm
Parallelism	<5 arc minutes
Chamfer	Protective<0.5mmx45°
Coating	Metallic (Inconel) reflective coating
OD Tolerance	OD±10%@Design Wavelength

Standard Products Of Reflective Neutral Density (ND) Filter:

PN.	Dimension (mm)	Thcikness (mm)	OD	Transmission (%)	Design Wavelength (nm)
RNDF25-0.1-400-1100	25.4	2	0.1	79	400-1100nm
RNDF25-0.2-400-1100	25.4	2	0.2	63	400-1100nm
RNDF25-0.3-400-1100	25.4	2	0.3	50	400-1100nm
RNDF25-0.4-400-1100	25.4	2	0.4	40	400-1100nm
RNDF25-0.5-400-1100	25.4	2	0.5	32	400-1100nm
RNDF25-0.8-400-1100	25.4	2	0.8	16	400-1100nm
RNDF25-1.0-400-1100	25.4	2	1.0	10	400-1100nm
RNDF25-2.0-400-1100	25.4	2	2.0	1	400-1100nm
RNDF25-3.0-400-1100	25.4	2	3.0	0.1	400-1100nm
RNDF25-4.0-400-1100	25.4	2	4.0	0.01	400-1100nm

Spectrum Graphs of Reflective Neutral Density (ND) Filter:

400-1100nm Reflective ND filter OD0.1