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
BBP-850A is a near-infrared bandpass filter centred around 850 nm. It delivers a high transmission window of about ~94–96% across roughly ~800–890 nm, with steep edges that quickly suppress out-of-band light. Outside the main passband, transmission stays near the baseline across most of 300–780 nm and ~920–1100 nm (generally ~0–1% T). The spectrum shows a strong rise again beyond ~1.12 µm, climbing sharply toward the SWIR and reaching roughly ~60% T by ~1.2 µm, which is worth noting for SWIR-sensitive detectors.
Key advantages
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High 850 nm throughput: ~94–96% T across ~800–890 nm for efficient 850 nm LED and laser-diode use.
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Steep band edges: Rapid cut-on and cut-off around the ~790 nm and ~900 nm regions for clean spectral separation.
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Low out-of-band leakage (VIS–NIR): Near-baseline transmission across most of 300–780 nm and ~920–1100 nm reduces background and improves contrast.
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SWIR leakage awareness: Transmission rises strongly beyond ~1.12 µm and can reach ~60% by ~1.2 µm; additional blocking can be added if required.
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Production-ready build: Durable dielectric coating; optional rear-surface anti-reflection and slight wedge available to suppress ghosts/flare.
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Custom formats: Borofloat®, Eagle XG or D263 T (0.21–3.8 mm) for high-temp use to ~450 °C; economical soda-lime for ≤150 °C. Custom sizes 5–450 mm.
Typical applications
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850 nm IR illumination: Improve signal-to-background for machine vision and controlled IR imaging.
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Biometrics and access control: Enhance contrast for iris/face illumination at 850 nm.
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IR beacons and tracking: Pass the 850 nm marker band while rejecting visible clutter.
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Optical sensing and photometry: Clean 850 nm channel for reflectance and absorption measurements.
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Industrial inspection: Reduce broadband glare while preserving the 850 nm working wavelength.
Need test chips tomorrow or thousands next quarter? BBP-850A filters are coated and cut-to-size (including dicing) to your exact spec—fast.
