BBP-940 Bandpass Filter
BBP-940 isolates the 940 nm channel with ~96–98 % peak transmission and near-baseline leakage across VIS–NIR—built for ToF, tracking, and NIR machine vision.
- Peak transmission: ~96–98 % T near 940 nm
- Band edges: Steep cut-on/cut-off around ~900–1000 nm
- Out-of-band (VIS–NIR): ~0–1 % T across ~300 – 900 nm
- Out-of-band (NIR): ~0–1 % T across ~1000 – 1200 nm
- 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-940 is a near-infrared bandpass filter centred on 940 nm, delivering a high
transmission peak (~96–98 %) with steep edges that rapidly suppress out-of-band light. Outside the
passband, transmission remains near baseline (typically ~0–1 %) across most of the visible and
near-IR (300–900 nm and ~1000–1200 nm), improving contrast and reducing sensor bloom under
mixed illumination.
Typical uses: 940 nm IR illumination, time-of-flight and structured light depth systems,
biometric illumination (iris/face), IR beacons and tracking markers, and reflectance/absorption photometry
where a clean 940 nm channel is required.
KUPO can add rear-surface AR, slight wedge, and custom blocking as needed, supplying everything from small
test chips to 450 mm plates on high-temperature glass (Borofloat®, Eagle XG, D263 T) or economical
soda-lime.
Description
BBP-940 is a near-infrared bandpass filter centred around 940 nm. It delivers a high transmission peak of about ~96–98% in the 940 nm region, with steep edges that quickly suppress out-of-band light. Outside the passband, transmission stays near the baseline (generally ~0–1% across most of 300–900 nm and ~1000–1200 nm), with only small residual features.
Key advantages
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High 940 nm throughput: Peaks around ~96–98% T for efficient 940 nm LED and laser-diode use.
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Steep band edges: Rapid cut-on/cut-off around the 900–1000 nm region for clean spectral separation.
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Low out-of-band leakage: Near-baseline transmission across the visible and most of the near-IR reduces background and improves contrast.
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Stray-light control: Strong rejection outside the passband helps keep sensors from blooming under mixed illumination.
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Production-ready build: Durable dielectric coating; optional rear-surface AR 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, and custom specifications are available.
Typical applications
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940 nm IR illumination: Improve signal-to-background for machine vision, night vision, and presence sensing.
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ToF and structured light: Isolate 940 nm emitters from ambient light for stable depth measurements.
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Biometric systems: Enhance contrast for iris/face illumination at 940 nm.
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IR beacons and tracking: Reject visible clutter while passing the 940 nm marker band.
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Optical sensing and photometry: Clean 940 nm channel for reflectance and absorption measurements.
Need test chips tomorrow or thousands next quarter? BBP-940 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
