BBP-680 Bandpass Filter
BBP-680 isolates the red / NIR channel with ~95–97 % transmission across ~650–730 nm and near-baseline leakage elsewhere—ideal for inspection, sensing and multispectral imaging.
- Main passband (T): ~95–97 % T @ 650 – 730 nm
- Cut-on / cut-off: Steep edges near ~640 nm and ~740 nm
- Out-of-band (VIS): ~0–2 % T across 300 – 650 nm
- Out-of-band (NIR): ~0–2 % T across 740 – 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-680 is a red / near-infrared bandpass centred around 680–700 nm, delivering
~95–97 % transmission through the ~650–730 nm window with steep edges that rapidly suppress
out-of-band light. Outside the passband, transmission stays near baseline (~0–2 %) across most
of the visible and near-IR (300–650 nm and 740–1200 nm), reducing background and preventing
veiling glare under broadband illumination.
Typical uses: red LED illumination for machine vision, fluorescence/bio-imaging red channels,
photometry and reflectance sensing, vegetation imaging workflows, and channel separation in multispectral
instruments. 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-680 is a deep red filter centered at 674 nm with a 74 nm FWHM passband (652-726 nm). Peak transmission reaches 96.5 %. This filter captures the deep red region and extends smoothly into the near-infrared, making it ideal for red imaging with optional NIR sensitivity. The smooth spectral transition from visible red (47.1 %) through NIR provides a unique dual-band characteristic for applications blending red and near-infrared information.
Key Advantages
- Deep red plus NIR transition – 74 nm FWHM spanning 652-726 nm captures deep red with seamless transition into near-infrared
- High peak transmission – 96.5 % at center wavelength ensures bright signal and minimal optical losses
- Hard-oxide ion-assisted durability – Multilayer dichroic coating maintains spectral performance through thermal and environmental extremes
- Flexible format options – Custom round, square, and free-form blanks from 5 mm to 450 mm with thickness 0.21-3.8 mm
- Multiple substrate grades – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG support diverse optical architectures
Typical Applications
- Red-NIR dual imaging – Combined deep red and near-infrared measurement in single-channel optical systems
- Machine vision – Deep red detection in industrial inspection systems with optional NIR sensitivity
- Biomedical sensing – Red fluorophore and hemoglobin-sensitive measurement in medical diagnostic systems
- Scientific research – Photometry and spectroscopic analysis spanning visible red through near-infrared
- Thermal sensing fusion – Red visible component in combined thermal-visible imaging architectures
Accelerate your red-NIR application development with BBP-680 prototypes available in weeks. Rapid manufacturing supports both evaluation and high-volume production.
FAQ
BBP-680 FAQ
What is BBP-680 and what is it used for?
BBP-680 is a Deep red bandpass extending into near-infrared. The BBP-680 is a deep red filter centered at 674 nm with a 74 nm FWHM passband (652-726 nm). Peak transmission reaches 96.5 %. Common uses include Red-NIR dual imaging, Machine vision, Biomedical sensing, and Scientific research.
What are the key optical specs of BBP-680?
Key published specs for BBP-680 include Centre wavelength (CWL): 689 nm; Bandwidth (FWHM): 75.1 nm; Peak transmittance: ≥ 96.5 % T; Passband range: 651 – 726 nm; Edge steepness: ~13 nm (10 → 90 % per edge).
What applications is BBP-680 best suited for?
BBP-680 is commonly used for Red-NIR dual imaging, Machine vision, Biomedical sensing, and Scientific research. Red-NIR dual imaging - Combined deep red and near-infrared measurement in single-channel optical systems.
Can BBP-680 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-680 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. Flexible format options - Custom 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-680?
The published angle of incidence for BBP-680 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
