BBP-525 Bandpass Filter
BBP-525 delivers a bright green window (~93–95 % T from ~480–570 nm) with low leakage across VIS–NIR—ideal for high-contrast green imaging and illumination.
- Main passband (T): ~93–95 % T @ 480 – 570 nm
- Cut-on / cut-off: Steep edges near ~470 nm and ~590 nm
- Out-of-band (VIS–NIR): Typically low, with small ripples (often 1–5 %, occasional 5–12 % in 650–1100 nm)
- SWIR window: ~90–95 % T @ 1180 – 1210 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-525 is a green visible bandpass centred near 525 nm, delivering
~93–95 % transmission across a broad ~480–570 nm window with steep edges for clean
separation from neighbouring colours. Outside the passband, transmission stays low across most
of the visible and near-IR, with only small ripple features (typically low single digits, and
occasionally up to ~5–12 % in the 650–1100 nm region depending on configuration).
Note for SWIR-sensitive detectors: a strong secondary window can appear near ~1180–1210 nm
and reach ~90–95 % transmission. If your sensor responds beyond 1.1 µm, KUPO can add an
additional blocking stack to suppress this SWIR band fully.
Typical uses: green LED inspection lighting, microscopy colour-channel separation,
green-band fluorescence imaging, reflectance/absorption photometry around 525 nm, and
stray-light control in optical 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-525 is a broad-aperture visible filter centered in the green region with a 99 nm FWHM passband (475-574 nm). Peak transmission reaches 94.7 %. This expansive green pass admits both blue and yellow wavelengths, making it ideal for color imaging where red separation is less critical. An intentional 21.8 % SWIR transparency window adds a second spectral dimension for applications combining visible and thermal imaging.
Key Advantages
- Broad green-yellow passband – 99 nm FWHM captures the full green spectrum from blue-green through yellow for vivid color imaging
- Dual-window transparency – 21.8 % SWIR transmission enables combined visible-thermal sensing in a single optical path
- Hard-oxide dichroic coating – Ion-assisted multilayer ensures long-term spectral stability under environmental and thermal cycling
- Flexible custom formats – Round, square, and free-form blanks from 5 mm to 450 mm; thickness 0.21-3.8 mm available
- Substrate variety – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrates accommodate diverse designs
Typical Applications
- Machine vision color detection – Green-channel imaging in industrial color sorting and quality assurance systems
- Scientific spectroscopy – Chlorophyll and green-emitting fluorophore analysis in biomedical research
- Botanical and agricultural – Plant health monitoring and chlorophyll content assessment using green wavelengths
- Thermal-visible fusion – Combined green visible and SWIR thermal imaging for enhanced scene understanding
- Emerging display technology – Green-channel component in advanced projectors and spatial computing systems
Prototype your green-channel application with rapid BBP-525 custom manufacturing. We deliver single units for testing through high-volume production.
FAQ
BBP-525 FAQ
What is BBP-525 and what is it used for?
BBP-525 is a Broad green bandpass with SWIR transmission window. The BBP-525 is a broad-aperture visible filter centered in the green region with a 99 nm FWHM passband (475-574 nm). Peak transmission reaches 94.7 %. Common uses include Machine vision color detection, Scientific spectroscopy, Botanical and agricultural, and Thermal-visible fusion.
What are the key optical specs of BBP-525?
Key published specs for BBP-525 include Centre wavelength (CWL): 524.4 nm; Bandwidth (FWHM): 100 nm; Peak transmittance: ≥ 94.7 % T; Passband range: 474 – 574 nm; Edge steepness: ~30 nm (10 → 90 % per edge).
What applications is BBP-525 best suited for?
BBP-525 is commonly used for Machine vision color detection, Scientific spectroscopy, Botanical and agricultural, and Thermal-visible fusion. Machine vision color detection - Green-channel imaging in industrial color sorting and quality assurance systems.
Can BBP-525 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-525 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 custom formats - Round, square, and free-form blanks from 5 mm to 450 mm; thickness 0.21-3.8 mm available.
What should I know about angle of incidence and durability for BBP-525?
The published angle of incidence for BBP-525 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
