Home » IR985,985nm Infrared cut-off,AR coated Unmounted Optical Shortpass Filter for surveillance, spectroscopy, and machine vision

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IR985,985nm Infrared cut-off,AR coated Unmounted Optical Shortpass Filter for surveillance, spectroscopy, and machine vision

Product features

● Anti-reflection (AR) coating

● Narrow transition zone slope less than 20nm transmission

● High transmittance over 90% or higher

● Deep cutoff depth OD2-OD3 or customized

●Multiple substrates available

●Customization supported

Product Detail

1.Product Descriptions：

Characteristics:	985nm IR Cut-Off Filter
Type:	Interference type filter
Cut-off Wavelength(in nm):	985 nm
Average Transmittance(%) :	>92%
Optical Density (OD):	OD2-OD3
Color:	Black
Surface Quality:	60/40 scratch-dig
Dimension(mm):	Standard for 86x86mm, 80x80mm, other can customized, max. 300x300mm
Thickness(mm):	Available: 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc.
Substrate:	Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified.
Remark: Spectral range:380-1100nm

2.Spectral measurement:

Picture 1: IR985nm Spectral measurement graph for reference

3.What is 985nm IR Cut-Off Filter？

A 985nm IR cut-off filter is a type of shortpass filter, which transmits light with wavelengths shorter than 985nm and blocks light with wavelengths longer than 985nm.

4.What is typical application for 985nm IR Cut-Off Filters?

985nm IR Cut-Off Filters find extensive application across various fields:

Security and night vision systems: works with image sensors to block visible light interference, allowing only infrared light to reach the sensor, thereby improving imaging sensitivity and clarity in night vision surveillance.
Infrared light source selection: separates and extracts pure 985nm-band infrared light from composite light sources such as white light.
Scientific research and spectral analysis: applied in research fields requiring precise optical bands, including fluorescence excitation spectroscopy, Raman spectroscopy, and astronomical observation.
Imaging and machine vision systems: eliminates out-of-band stray light to enhance imaging clarity and system sensitivity.

5.What is key parameter when choose for suitable IR cut-off Filter?

When selecting IR cut-off filters, normally the following factors need to be taken into consideration：

Cut-off Wavelength: refers to the designated intermediated wavelength (e.g. 650nm) at transition from transmission to reflective zone, and measure at 50% transmittance.
Peak or Average Transmittance(in %): typically ≥90%, Higher transmittance might need Anti-reflective(AR) coating.
Blocking rate: usually in terms of optical density(OD), OD2-OD3 for standard and higher blocking rate will be OD4-OD6 per requirement.
Angle of Incidence (AOI): AOI need to be considered as Interference Filter is angle sensitive, 0° AOI by default, other AOI e.g. 30/45° need to be specified.
Physical and environmental requirement: Substrate type, dimensions and thickness, surface quality, and environmental durability.

Related products:

NIR,IR 950nm Infrared cut-off Filter, AR coated, Dia. 6.6*6.6mm,T 1.1mm, Support customized

Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical vacuum technology that apply depositing nano-materials through ion-assisted evaporation onto a multilayer hard film in a high vacuum environment which coating layer is firm and has good tightness, and small bandwidth drift. Besides, Liyuan optoelectronics have been focus on optical coating for more than 17 years ,and the company offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass Filters, Shortpass Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.

Remark: Because the interference type filter varies its performance at different angles, the spectral parameters usually determine its appearance color; moreover, the pictures in this link may originate from various shooting angles, so the actual color should therefore rely on the final spectral parameters required as the standard.