BBP-940W2 Bandpass Filter
BBP-940W2 isolates the 940 nm channel with ~97 % throughput across ~915–995 nm and near-baseline leakage elsewhere—ideal for ToF, tracking, and NIR machine vision.
- Main passband (T): ~96–98 % T @ 915 – 995 nm
- Cut-on / cut-off: Steep edges near ~900 nm and ~1000 nm
- Out-of-band (VIS–NIR): ~0–2 % T across ~300 – 900 nm
- Out-of-band (NIR): ~0–2 % T across ~1020 – 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-940W2 is a high-efficiency near-infrared bandpass centred on 940 nm, delivering
~96–98 % transmission across ~915–995 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
(300–900 nm and ~1020–1200 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 matters.
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-940W2 is a wide near-infrared filter centered at 954 nm with a broad 81 nm FWHM passband (913-994 nm). Peak transmission reaches 98.6 % - exceptionally high for a wide variant. Designated 'W2', this filter balances the narrow standard BBP-940's spectral purity against maximum light collection. The 52.7 % NIR(850-1000) transmission and minimal SWIR leakage make this ideal for applications prioritizing brightness over narrow isolation.
Key Advantages
- Broad 940 nm passband – 81 nm FWHM captures maximum 940 nm light for high-sensitivity applications
- High peak transmission – 98.6 % - exceptional efficiency for a wide variant ensures maximum light throughput
- Hard-oxide ion-assisted durability – Dichroic multilayer coating maintains performance across automotive and industrial thermal extremes
- Custom blank availability – Round, square, and free-form options from 5 mm to 450 mm with thickness 0.21-3.8 mm
- Substrate variety – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG accommodate diverse designs
Typical Applications
- High-brightness LiDAR – Time-of-flight systems prioritizing maximum light collection over narrow spectral filtering
- Long-range sensing – Extended detection range in autonomous vehicles and robotics via maximum signal throughput
- Scientific research – Broad-band NIR photometry and spectroscopic measurement in 900-1000 nm window
- Industrial imaging – Bright 940 nm thermal and NIR imaging in harsh manufacturing and material inspection
- Emerging 3D sensing – Next-generation depth imaging for AR, VR, and spatial computing systems
Accelerate high-brightness 940 nm system development with BBP-940W2 prototypes. Rapid custom manufacturing supports both research and production deployment.
FAQ
BBP-940W2 FAQ
What is BBP-940W2 and what is it used for?
BBP-940W2 is a Wide 940 nm bandpass W2 variant with high peak transmission. The BBP-940W2 is a wide near-infrared filter centered at 954 nm with a broad 81 nm FWHM passband (913-994 nm). Peak transmission reaches 98.6 % - exceptionally high for a wide variant. Common uses include High-brightness LiDAR, Long-range sensing, Scientific research, and Industrial imaging.
What are the key optical specs of BBP-940W2?
Key published specs for BBP-940W2 include Centre wavelength (CWL): 953.3 nm; Bandwidth (FWHM): 81.2 nm; Peak transmittance: ≥ 98.6 % T; Passband range: 913 – 994 nm; Edge steepness: ~23 nm (10 → 90 % per edge).
What applications is BBP-940W2 best suited for?
BBP-940W2 is commonly used for High-brightness LiDAR, Long-range sensing, Scientific research, and Industrial imaging. High-brightness LiDAR - Time-of-flight systems prioritizing maximum light collection over narrow spectral filtering.
Can BBP-940W2 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-940W2 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 with thickness 0.21-3.8 mm.
What should I know about angle of incidence and durability for BBP-940W2?
The published angle of incidence for BBP-940W2 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
