BBP-850B Bandpass Filter
BBP-850B isolates the 850 nm channel with ~96–98 % transmission across ~820–890 nm and near-baseline leakage across VIS–NIR—ideal for biometrics, tracking, and NIR machine vision.
- Main passband (T): ~96–98 % T @ 820 – 890 nm
- Cut-on / cut-off: Steep edges near ~800 nm and ~900 nm
- Out-of-band (VIS–NIR): ~0–1 % T across ~300 – 1100 nm
- SWIR window: ~35–45 % T @ 1180 – 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-850B is a near-infrared bandpass centred around 850 nm, delivering
~96–98 % transmission across ~820–890 nm with steep edges that rapidly suppress
out-of-band light. Outside the main window, transmission stays near baseline (~0–1 %)
across most of 300–1100 nm, reducing background and improving contrast under mixed illumination.
Note for SWIR-sensitive detectors: a secondary transmission region can appear near ~1180–1200 nm
and reach ~35–45 % transmission. If your sensor responds beyond 1.1 µm, KUPO can add an
additional blocking stack to suppress this SWIR band 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-850B is a moderate-width near-infrared filter centered at 841 nm with a 73 nm FWHM passband (811-884 nm). Peak transmission reaches 97.3 % - the highest among all 850 nm variants. This optimized balance between passband width and peak efficiency makes BBP-850B the go-to choice when your system demands maximum signal collection without sacrificing too much spectral selectivity. Visible blocking is superior, with NIR leakage at 26.2 % providing good isolation.
Key Advantages
- Exceptional peak transmission – 97.3 % at center wavelength - highest of all 850 nm family members for maximum signal throughput
- Optimal passband balance – 73 nm FWHM offers sweet spot between light collection and spectral selectivity
- Hard-oxide multilayer durability – Ion-assisted deposition provides stable performance across thermal extremes and environmental stress
- Custom format manufacturing – Round, square, and free-form blanks from 5 mm to 450 mm with thickness 0.21-3.8 mm available
- Multiple substrate grades – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG match your optical requirements
Typical Applications
- Machine vision systems – High-brightness 850 nm imaging in industrial automation and real-time inspection
- Scientific photometry – Precision optical measurements and spectroscopic analysis in research laboratories
- Medical and biomedical – Near-infrared tissue imaging and non-invasive diagnostic instrumentation
- Telecom and networking – Optical filtering in fiber communication systems and wavelength-division multiplexing
- Sensor technology – Environmental monitoring and proximity detection in autonomous systems
Bring your 850 nm application to life with BBP-850B prototypes. Rapid turnaround on custom formats supports both pilot programs and full-scale production runs.
FAQ
BBP-850B FAQ
What is BBP-850B and what is it used for?
BBP-850B is a Moderate-width 850 nm bandpass with highest peak transmission. The BBP-850B is a moderate-width near-infrared filter centered at 841 nm with a 73 nm FWHM passband (811-884 nm). Peak transmission reaches 97.3 % - the highest among all 850 nm variants. Common uses include Machine vision systems, Scientific photometry, Medical and biomedical, and Telecom and networking.
What are the key optical specs of BBP-850B?
Key published specs for BBP-850B include Centre wavelength (CWL): 847.6 nm; Bandwidth (FWHM): 73.6 nm; Peak transmittance: ≥ 97.3 % T; Passband range: 811 – 884 nm; Edge steepness: ~17 nm (10 → 90 % per edge).
What applications is BBP-850B best suited for?
BBP-850B is commonly used for Machine vision systems, Scientific photometry, Medical and biomedical, and Telecom and networking. Machine vision systems - High-brightness 850 nm imaging in industrial automation and real-time inspection.
Can BBP-850B be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-850B 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. Custom format manufacturing - Round, square, and free-form blanks from 5 mm to 450 mm with thickness 0.21-3.8 mm available.
What should I know about angle of incidence and durability for BBP-850B?
The published angle of incidence for BBP-850B is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
