BBP-940W3 Bandpass Filter
BBP-940W3 isolates the 940 nm channel with ~90 % throughput from 910–980 nm and near-baseline leakage everywhere else—built for ToF, tracking and NIR machine vision.
- Passband (T): ~88–90 % T @ 910 – 980 nm
- Cut-on / cut-off: Steep edges near ~900 nm and ~1000 nm
- Out-of-band: ~0–3 % T from 300 – 900 nm and 1000 – 1100 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-940W3 is a near-infrared bandpass centred on 940 nm, delivering a high-transmission
window (~88–90 %) across ~910–980 nm with steep edges that rapidly suppress out-of-band light. Outside the
passband, transmission stays close to the baseline (typically ~0–3 % across 300–900 nm and ~1000–1100 nm),
helping sensors stay stable under mixed illumination and preventing bloom or flare.
Typical uses: 940 nm IR illumination, time-of-flight and structured light depth systems, eye-safe
biometrics, IR beacons/tracking, and reflectance/absorption photometry where a clean 940 nm channel matters.
KUPO can supply rear-surface AR, slight wedge, and rapid custom cutting—from small test chips to 450 mm
plates—on high-temp glass (Borofloat®, Eagle XG, D263 T) or economical soda-lime.
Description
The BBP-940W3 is a wide near-infrared filter centered at 938 nm with a broad 81 nm FWHM passband (907-988 nm). Peak transmission reaches 90.2 %. Designated 'W3', this wide variant offers the broadest 940 nm spectral coverage while maintaining clean visible rejection. Compared to W2, W3 trades peak efficiency (90.2 % vs 98.6 %) for even broader passband acceptance, ideal for maximum signal from diverse 940 nm sources.
Key Advantages
- Broadest 940 nm aperture – 81 nm FWHM spanning 907-988 nm maximizes light collection from full 940 nm spectral range
- Clean visible rejection – All visible wavelengths below 3.1 %, ensuring daylight robustness despite broad NIR passband
- Hard-oxide ion-assisted coating – Dichroic multilayer design withstands thermal cycling and harsh automotive environments
- Custom format flexibility – Round, square, and free-form blanks 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
- Maximum-aperture LiDAR – Broadest 940 nm pass for time-of-flight systems maximizing light collection from extended range
- Sensitivity-optimized systems – Extreme low-light 940 nm sensing in autonomous vehicles and robotics
- Scientific research – Broadest NIR spectroscopy in 900-1000 nm window for research instruments
- Industrial process control – Broad 940 nm monitoring and measurement in manufacturing and quality assurance
- Emerging depth sensing – Next-generation 3D imaging for AR systems and spatial computing platforms
Integrate BBP-940W3 for maximum 940 nm aperture systems with rapid custom manufacturing. Supports both prototype development and high-volume production.
FAQ
BBP-940W3 FAQ
What is BBP-940W3 and what is it used for?
BBP-940W3 is a Wide 940 nm bandpass W3 variant for broadest 940 nm coverage. The BBP-940W3 is a wide near-infrared filter centered at 938 nm with a broad 81 nm FWHM passband (907-988 nm). Peak transmission reaches 90.2 %. Common uses include Maximum-aperture LiDAR, Sensitivity-optimized systems, Scientific research, and Industrial process control.
What are the key optical specs of BBP-940W3?
Key published specs for BBP-940W3 include Centre wavelength (CWL): 947.6 nm; Bandwidth (FWHM): 84.9 nm; Peak transmittance: ≥ 90.2 % T; Passband range: 905 – 990 nm; Edge steepness: ~33 nm (10 → 90 % per edge).
What applications is BBP-940W3 best suited for?
BBP-940W3 is commonly used for Maximum-aperture LiDAR, Sensitivity-optimized systems, Scientific research, and Industrial process control. Maximum-aperture LiDAR - Broadest 940 nm pass for time-of-flight systems maximizing light collection from extended range.
Can BBP-940W3 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-940W3 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 format flexibility - Round, square, and free-form blanks 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-940W3?
The published angle of incidence for BBP-940W3 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
