BBP-850D Bandpass Filter
BBP-850D isolates the 850 nm channel with ~92–95 % peak transmission and near-baseline leakage across VIS–NIR—ideal for biometrics, tracking, and NIR machine vision.
- Peak transmission: ~92–95 % T @ 840 – 870 nm
- Band edges: Steep cut-on/cut-off around the 850 nm region
- Out-of-band (VIS–NIR): ~0–1 % T across ~300 – 1100 nm
- SWIR window: ~60–65 % T @ 1180 – 1210 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-850D is a narrow near-infrared bandpass centred around 850 nm, delivering
~92–95 % peak transmission in the ~840–870 nm window with steep edges that rapidly suppress
out-of-band light. Outside the main passband, transmission stays near baseline (~0–1 %) across
most of 300–1100 nm to reduce background and improve signal-to-noise under mixed illumination.
Note for SWIR-sensitive detectors: a secondary window can appear near ~1180–1210 nm and reach
~60–65 % transmission. If your sensor responds beyond 1.1 µm, KUPO can add an additional
blocking stack to fully suppress that band.
Typical uses: 850 nm IR illumination, biometrics/access control, IR beacons & tracking,
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-850D is a near-infrared bandpass filter centred around 850 nm. It delivers a narrow, high transmission peak of about ~92–95% near ~840–870 nm with steep edges that quickly suppress out-of-band light. Outside the main passband, transmission stays near the baseline (generally ~0–1% across most of 300–1100 nm). The spectrum also shows a strong secondary transmission window in the SWIR near ~1180–1210 nm, reaching roughly ~60–65% T, which is worth noting if your detector is sensitive beyond 1.1 µm.
Key advantages
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High 850 nm throughput: ~92–95% T at the main passband peak for efficient 850 nm LED and laser-diode use.
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Narrow band selection: Tight spectral window around ~850 nm improves contrast by rejecting adjacent wavelengths.
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Low out-of-band leakage (VIS–NIR): Near-baseline transmission across most of 300–1100 nm reduces background and improves signal-to-noise.
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SWIR leakage awareness: A secondary window appears near ~1180–1210 nm (up to ~60–65% T); 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 night-vision lighting.
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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-850D filters are coated and cut-to-size (including dicing) to your exact spec—fast.
