BBP-850A Bandpass Filter
BBP-850A isolates the 850 nm channel with ~94–96 % transmission across ~800–890 nm and near-baseline leakage across VIS–NIR—built for biometrics, tracking, and NIR machine vision.
- Main passband (T): ~94–96 % T @ 800 – 890 nm
- Cut-on / cut-off: Steep edges near ~790 nm and ~900 nm
- Out-of-band (VIS): ~0–1 % T across ~300 – 780 nm
- Out-of-band (NIR): ~0–1 % T across ~920 – 1100 nm
- SWIR rise: Strong rise > 1120 nm, up to ~60 % T by ~1200 nm (optional extra blocking)
- Ghost control: Optional rear AR and slight wedge available
- Substrates: Borofloat®, Eagle XG, D263 T (≤ 450 °C), soda-lime (≤ 150 °C)
- Size / thickness: 5 – 450 mm • 0.21 – 3.8 mm (custom cut & dicing)
Learn more
BBP-850A is a near-infrared bandpass centred around 850 nm, delivering
~94–96 % transmission across ~800–890 nm with steep edges that rapidly suppress
out-of-band light. Outside the main window, transmission stays near baseline (~0–1 %)
across most of the visible and near-IR (300–780 nm and ~920–1100 nm), reducing
background and improving contrast under mixed illumination.
Note for SWIR-sensitive detectors: transmission can rise again beyond ~1.12 µm and reach
roughly ~60 % by ~1.2 µm. If your sensor responds in that region, KUPO can add an
additional blocking stack to suppress the SWIR rise fully.
Typical uses: 850 nm IR illumination for machine vision, biometrics/access control,
IR beacons and tracking markers, reflectance/absorption photometry, and industrial inspection where
the 850 nm band must remain clean. KUPO supplies rear-surface AR, slight wedge, and rapid custom
cutting—from small test chips to 450 mm plates—on high-temperature glass (Borofloat®, Eagle XG,
D263 T) or economical soda-lime.
Description
The BBP-850A is a wide-aperture near-infrared filter centered at 840 nm with an expansive 97 nm FWHM passband (796-893 nm). Transmission peaks at 95.6 %, capturing a generous portion of the 850 nm band favored by many optical systems. This variant accepts moderate blocking efficiency across visible and SWIR regions, trading some rejection for spectral breadth - ideal when your application demands maximum light collection across the 850 nm family.
Key Advantages
- Generous passband width – 97 nm FWHM provides maximum light collection for 850 nm applications requiring broad spectral acceptance
- High peak transmission – 95.6 % at center wavelength ensures bright signal and minimal optical losses in NIR systems
- Hard-oxide ion-assisted coating – Dichroic multilayer design withstands harsh environmental and thermal cycling without performance drift
- Modular substrate selection – Round, square, and free-form custom blanks from 5 mm to 450 mm; thickness range 0.21-3.8 mm
- Standard and specialty glasses – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrates accommodate diverse optical designs
Typical Applications
- Machine vision – Industrial automation and part inspection using 850 nm LED illumination and NIR cameras
- Scientific sensing – Spectroscopic and photometry measurements in the 850 nm window
- Biomedical diagnostics – Non-invasive tissue analysis and optical coherence tomography (OCT) systems
- Telecommunications – Optical signal filtering in fiber-based communication and sensing networks
- Autonomous vehicle sensing – Broad 850 nm pass for night-vision and proximity detection in mobile robotics
Accelerate your 850 nm system development with rapid prototyping. We deliver custom BBP-850A configurations for small-scale validation through full production volumes.
FAQ
BBP-850A FAQ
What is BBP-850A and what is it used for?
BBP-850A is a Wide near-infrared bandpass for flexible 850 nm applications. The BBP-850A is a wide-aperture near-infrared filter centered at 840 nm with an expansive 97 nm FWHM passband (796-893 nm). Transmission peaks at 95.6 %, capturing a generous portion of the 850 nm band favored by many optical systems. Common uses include Machine vision, Scientific sensing, Biomedical diagnostics, and Telecommunications.
What are the key optical specs of BBP-850A?
Key published specs for BBP-850A include Centre wavelength (CWL): 844.7 nm; Bandwidth (FWHM): 98.4 nm; Peak transmittance: ≥ 95.6 % T; Passband range: 795 – 894 nm; Edge steepness: ~24 nm (10 → 90 % per edge).
What applications is BBP-850A best suited for?
BBP-850A is commonly used for Machine vision, Scientific sensing, Biomedical diagnostics, and Telecommunications. Machine vision - Industrial automation and part inspection using 850 nm LED illumination and NIR cameras.
Can BBP-850A be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-850A as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include CWL shifting, bandwidth tuning, custom blocking ranges, rapid prototypes. Modular substrate selection - Round, square, and free-form custom blanks from 5 mm to 450 mm; thickness range 0.21-3.8 mm.
What should I know about angle of incidence and durability for BBP-850A?
The published angle of incidence for BBP-850A is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
