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
The BBP-940W1 is a wide-aperture near-infrared filter centered at 924 nm with an expansive 108 nm FWHM passband (889-997 nm). Transmission peaks at 93.2 %. Designated as the 'W1' wide variant, this filter maximizes light collection across the 940 nm family - ideal for applications prioritizing signal brightness over narrow spectral discrimination. Visible blocking is exceptional, with SWIR leakage at 14.6 % providing some thermal sensing capability.
Key Advantages
- Broadest 940 nm passband – 108 nm FWHM captures maximum light for 940 nm face detection, LiDAR, and proximity sensing
- Strong visible rejection – Visible light transmission plunges below 2 %, isolating 940 nm signal from ambient illumination
- Hard-oxide dichroic coating – Ion-assisted multilayer design maintains spectral stability under thermal and mechanical cycling
- Custom blank availability – Round, square, and free-form options from 5 mm to 450 mm; flexible thickness from 0.21-3.8 mm
- Substrate flexibility – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG support your optical architecture
Typical Applications
- 3D LiDAR systems – Wide 940 nm acceptance for time-of-flight and structured-light depth sensing
- Face detection – 940 nm biometric sensing in consumer devices and security systems
- Autonomous vehicle perception – Broad 940 nm pass for object detection and near-field obstacle avoidance
- Industrial sensing – Material presence and distance measurement at 940 nm with high signal throughput
- Scientific research – Broad-spectrum NIR photometry in optical and biological measurement systems
Accelerate your 940 nm system design with BBP-940W1 prototypes ready in weeks. We support everything from initial evaluation to high-volume manufacturing.
FAQ
BBP-940W1 FAQ
What is BBP-940W1 and what is it used for?
BBP-940W1 is a Wide 940 nm bandpass for maximum 940 nm light capture. The BBP-940W1 is a wide-aperture near-infrared filter centered at 924 nm with an expansive 108 nm FWHM passband (889-997 nm). Transmission peaks at 93.2 %. Common uses include 3D LiDAR systems, Face detection, Autonomous vehicle perception, and Industrial sensing.
What are the key optical specs of BBP-940W1?
Key published specs for BBP-940W1 include Centre wavelength (CWL): 943.2 nm; Bandwidth (FWHM): 110.6 nm; Peak transmittance: ≥ 93.2 % T; Passband range: 888 – 999 nm; Edge steepness: ~40 nm (10 → 90 % per edge).
What applications is BBP-940W1 best suited for?
BBP-940W1 is commonly used for 3D LiDAR systems, Face detection, Autonomous vehicle perception, and Industrial sensing. 3D LiDAR systems - Wide 940 nm acceptance for time-of-flight and structured-light depth sensing.
Can BBP-940W1 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-940W1 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 blank availability - Round, square, and free-form options from 5 mm to 450 mm; flexible thickness from 0.21-3.8 mm.
What should I know about angle of incidence and durability for BBP-940W1?
The published angle of incidence for BBP-940W1 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
