The central wavelength is 940+/-2nm, which can be adapted to LED, VCSEL and laser.
The half bandwidth is 80+/-5nm, and the spectral range covers 880nm-1000nm, which can cope with the wavelength cheapness caused by light source aging and temperature fluctuations.
The transmittance in the transmission band is greater than or equal to 90%, which improves the utilization rate of effective light signals.
The cutoff depth outside the passband is OD4 in the range of 200-1700nm, which completely shields the interference of sunlight and indoor lights, and suppresses the thermal radiation noise of long-wave infrared.

940nm IR filter FWHM 80nm Technical Datasheet

Parameter	Specification
Center Wavelength (CWL)	940 nm ± 2 nm
FWHM	80nm ± 5nm
Peak Transmission	≥ 90%
Blocking Range	200 – 1700nm
Optical Density (OD)	OD4
Angle of Incidence (AOI)	0°
Clear Aperture	>90% of the diameter
Substrate Material	UV Fused Silica, K9,sapphire, Other optical glass
Size	Ø12.7mm, Ø25.4mm,Ø50.8mmor customizable
Environmental Durability	Compliant with MIL-STD-810G
Other available wavelength	940/10nm,940/20nm, 940/40nm,940/30nm,940/50nm,940/60nm,940/70nm
Custom Option	EUV to 30,000nm
Filter Type	Multilayer Interference Bandpass Filter
Coating Technology	Ion-Assisted Deposition (IAD), Hard coated
Surface Quality	80-50, 60-40, 40-20 (per MIL-PRF-13830B

940nm IR filter FWHM 80nm Applications

Machine vision inspection
In high-precision inspection of materials such as metal, glass, and semiconductor wafers, surface defects can be detected by 940/80nm bandpass filters. The wide bandwidth (880-1000nm) is compatible with light source fluctuations, avoiding spectral mismatch caused by temperature drift and improving defect recognition rate
Health monitoring
In smart watches/bracelets, 940nm near-infrared light penetrates the skin to detect blood absorption signals, and the 80nm bandwidth covers the characteristic absorption peak of hemoglobin, which is suitable for users with different skin colors
3D sensor
In smartphones, AR/VR devices, such as ToF cameras, 940/80nm broadband filters can be compatible with the wavelength dispersion problem of VCSEL arrays, achieving accurate depth perception in complex lighting environments, and the ranging error is less than 0.5%.
Security monitoring
The 940/80nm filter is suitable for 940nm invisible light night vision cameras to avoid the exposure of the monitoring position by traditional 850nm red light, especially for high-security scenes such as banks and prisons.