BBP-940W1 Bandpass Filter
BBP-940W1 isolates the 940 nm channel with ~91–93 % transmission across ~900–990 nm and near-baseline leakage elsewhere—ideal for ToF, tracking, and NIR machine vision.
- Main passband (T): ~91–93 % T @ 900 – 990 nm
- Cut-on / cut-off: Steep edges around ~880 nm and ~1000 nm
- Out-of-band (VIS–NIR): ~0–2 % T across 300 – 850 nm
- Out-of-band (NIR): ~0–2 % T across 1020 – 1100 nm
- SWIR peak: ~55–60 % T @ 1160 – 1190 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-940W1 is a near-infrared bandpass centred around 940 nm, delivering
~91–93 % transmission across ~900–990 nm with steep edges that rapidly suppress
out-of-band light. Outside the main window, transmission stays near baseline (~0–2 %)
across most of the visible and near-IR (300–850 nm and ~1020–1100 nm), improving
contrast and reducing sensor bloom under mixed illumination.
Note for SWIR-sensitive detectors: a secondary transmission peak can appear near ~1160–1190 nm
and reach ~55–60 % transmission. If your sensor responds beyond 1.1 µm, KUPO can add an
additional blocking stack to fully suppress this SWIR band.
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 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-940W1 is a near-infrared bandpass filter centred around 940 nm. It delivers a high transmission window of about ~91–93% across roughly ~900–990 nm, with steep edges that quickly suppress out-of-band light. Outside the main passband, transmission stays near the baseline (generally ~0–2% across most of 300–850 nm and ~1020–1100 nm). The spectrum also shows a noticeable secondary transmission peak in the SWIR near ~1160–1190 nm, rising to roughly ~55–60% T, which is worth noting for detectors sensitive beyond 1.1 µm.
Key advantages
-
High 940 nm throughput: ~91–93% T across ~900–990 nm for efficient 940 nm LED and laser-diode use.
-
Steep band edges: Rapid cut-on and cut-off around the ~880–1000 nm region for clean spectral separation.
-
Low out-of-band leakage (VIS–NIR): Near-baseline transmission across most of 300–850 nm and ~1020–1100 nm reduces background and improves contrast.
-
SWIR leakage awareness: A secondary peak appears near ~1160–1190 nm (up to ~55–60% T); additional blocking can be added if required.
-
Production-ready build: Durable dielectric coating; optional rear-surface anti-reflection and slight wedge available to suppress ghosts/flare.
-
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
-
940 nm IR illumination: Improve signal-to-background for machine vision, night vision, and presence sensing.
-
ToF and structured light: Isolate 940 nm emitters from ambient light for stable depth measurements.
-
Biometric systems: Enhance contrast for iris/face illumination at 940 nm.
-
IR beacons and tracking: Reject visible clutter while passing the 940 nm marker band.
-
Optical sensing and photometry: Clean 940 nm channel for reflectance and absorption measurements.
Need test chips tomorrow or thousands next quarter? BBP-940W1 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
