Central wavelength 809+/-2nm, specially designed for 809nm wavelength, tolerance strictly controlled within ±2nm, can accurately capture the target band
Half bandwidth 10+/-2nm, ultra-narrow passband, accurately matching near-infrared characteristic spectrum
The transmittance in the passband is greater than or equal to 90%, which can maximize the transmission of target signals
OD4 cutoff depth in the range of 200-1200nm, strongly suppresses visible light and long-wave infrared stray light, background noise
We use interference medium hard film coating technology, the filter film has strong adhesion, corrosion resistance, moisture resistance, and UV aging resistance

809/10nm Near Infared Narrow Bandpass Filter Technical Datasheet

Parameter	Specification
Center Wavelength (CWL)	809 nm ± 2 nm
Full Width at Half Maximum (FWHM)	10 nm ± 2 nm
Peak Transmission	≥ 90%
Blocking Range	200 – 1200nm
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 avaliable wavelength	809/20nm, 809/40nm
Custom Option	EUV to 30,000nm
Filter Type	Hard Coated, Multilayer Interference Bandpass Filter
Coating Technology	Ion-Assisted Deposition (IAD), Hard coated
Surface Quality	80-50, 60-40, 40-20 (per MIL-PRF-13830B)

809/10nm Near Infared Narrow Bandpass Filter Applications

Biomedical imaging
Biological tissues have high penetration in the near-infrared band, and the excitation/emission spectra of some fluorescent markers are concentrated in 800-810 nm. It is necessary to accurately extract the signal in this band to avoid interference from other stray light. The 809/10nm optical filter only allows 809±5 nm light to pass through, shielding other wavelengths to improve the signal-to-noise ratio of the target signal.
Spectral analysis
Many substances such as water, protein, and gas have characteristic absorption peaks in the near-infrared band, but the spectra of different components in complex samples are prone to overlap, requiring high-precision spectrometry. After using the 809/10nm filter, select a specific absorption peak near 809 nm to exclude scattered light of other wavelengths
Machine vision
In industrial scenes, ambient light interference is serious, and material defects or composition differences may appear in specific near-infrared bands. The 809/10nm bandpass filter only transmits 809 nm light, suppresses ambient light interference, improves detection accuracy and stability, and reduces scrap rate caused by misjudgment.
Optical communication
There is stray light noise in laser and optical communication systems, such as pump light leakage and ambient light interference, which requires the isolation of target wavelength signals. The 809/10nm filter can filter out non-signal wavelengths and protect the detector.