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IR660, 660nm infrared cutoff filter for fluorescence microscopy, machine vision

Product features

● Narrow transition zone slope less than 20nm transmission

● High transmittance over 90% or higher

● Deep cutoff depth OD2 or customized

●Multiple substrates available

●Customization supported

Product Detail

Product Descriptions：

Characteristics:	660nm IR Cut-Off Filter
Type:	Interference type filter
Cut-off Wavelength(in nm):	660 nm
Average Transmittance(%) :	>95%(with AR coating)
Optical Density (OD):	OD2
Color:	Blue
Surface Quality:	60/40
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

Spectral graph measurement example

Picture 1: IR660nm + AR Spectral measurement Graph

What is 660nm IR Cut-Off Filter?

A 660nm IR cut-off filter is a type of optical short pass filter, which core function is to efficiently transmit visible light below 660nm while blocking or reflecting near-infrared light above 660nm.

What is typical application for 660nm IR Cut-Off Filters?

The 660nm IR Cut-Off Filters find extensive application across various fields:

Fluorescence microscopy imaging: precisely transmits excitation light and emission fluorescence, deeply blocks stray light and autofluorescence, significantly improving the image signal-to-noise ratio.
Machine vision and industrial inspection: used with red or white illumination to exclude ambient infrared interference, ensuring that the sensor images within the visible spectrum.
Color cameras and security surveillance: used with fill-light systems to effectively suppress infrared interference in visible-light imaging mode, preventing image color cast and restoring true color reproduction.
Biomedical testing and endoscopy: employed in devices such as pulse oximeters, flow cytometers, and medical endoscopes to define the signal acquisition spectral range, ensuring detection accuracy.
Precision spectroscopic analysis: serves as a spectral separation element to completely isolate the visible band from the near-infrared band, preventing signal crosstalk on the detector.

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:

IR650 , 650nm Infrared cut-off Filter, Lens Filter, 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.