IR cut-off Optical Filters

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$1.00 - $5.00 / Pieces | 100 Piece/Pieces IR cut-off Optical Filters (Min. Order)
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Quick Details
Place of Origin:
Shanghai, China
Brand Name:
Model Number:
IR cut-off Optical Filters
Customed Size, according to your requirement
Optical Glass, Colored optical materials
Optical Instruments
according to your requirement
Surface Quality:
Optical Instruments
Other requirement:
Production date:
7-15 days
Supply Ability
Supply Ability:
100000 Piece/Pieces per Day IR cut-off Optical Filters
Packaging & Delivery
Packaging Details
Blister plate (100PCS/layer) for IR cut-off Optical Filters
Lead Time :
within 10-20 days



Specific parameters

IR cut-off Optical Filters


Material : Monocrystal line silicon N type. resistivity : 5-40Ω, crystallographic orientation 111
Specification : Φ6.65, Center thickness=2mm, F=1.95(Center thickness=1.5mm, F=3.9/5.5)
Precision (the highest) : N=5-10 , B=40/20 , C=0.1
Output : 100K-200K/month





MaterialBK7, BK9, silicon, Germanium, Sapphire, ect
Sizeaccording to your requires
Thickness according to your requires
Diameter Tolerance±0.10 
Thickness Tolerance±0.2 mm
Surface reflectance30% (per one surface)
Surface Quality (Scratch-Dig)60-40 (according to your requires)
Spherical Surface Powerbλ/2 (according to your requires)
Clear aperture  >= 90%central of the diameter
Wavelengthaccording to your requires
CoatingUncoated (according to your requires)
Surface reflectance30% (per one surface)




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Product Description

Infrared cut-off filters, sometimes called IR filters or heat-absorbing filters, are designed to reflect or block mid-infrared wavelengths while passing visible light. They are often used in devices with bright incandescent light bulbs (such as slide and overhead projectors) to prevent unwanted heating. There are also filters which are used in solid state (CCD or CMOS) video cameras to block IR due to the high sensitivity of many camera sensors to near-infrared light. These filters typically have a blue hue to them as they also sometimes block some of the light from the longer red wavelengths.



In contrast to the naming convention of optical filters where the name of the filter denotes the wavelengths that are blocked, and in line with the convention for air filters and oil filters, photographic filters are named for the color of light they pass. Thus a blue filter makes the picture look blue. A black filter marginally allows more light in the blue wavelength to pass resulting in a slight shift of the color temperature of the photo to a cooler color. Because of this, the term "IR filters" is commonly used to refer to filters that pass infrared light while completely blocking other wavelengths. However, in some applications the term "IR filter" still can be used as a synonym of infrared cut-off filter.

IR-transmitting (passing) filters, or removal of factory IR-blocking filters, are commonly used in infrared photography to pass infrared light and block visible and ultraviolet light. Such filters appear black to the eye, but are transparent when viewed with an IR sensitive device.

Since the dyes in processed film block various part of visible light but are all fairly transparent to infrared, dark black sections of any processed film (where all visible colors are blocked) pass only infrared light and are commonly used (layering one over another if necessary for better visual light filtering) as a cheap alternative to expensive glass-backed filters. Such filters can be used both over color camera lenses, and to filter visible light from IR illumination sources. Such filter stock is most easily made available most simply by having any commercial color negative film developed after being fully exposed to light.

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