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
BBP-525 is a green visible bandpass filter centred around ~525 nm. It delivers a high transmission window of about ~93–95% across roughly ~480–570 nm, with steep edges that quickly suppress adjacent wavelengths. Outside the main passband, transmission stays low across most of the visible and near-infrared, with a handful of small ripple peaks (generally in the low single digits, occasionally up to ~5–12% in the 650–1100 nm region). The spectrum also shows a strong secondary transmission window in the SWIR near ~1180–1210 nm, rising sharply to ~90–95% T, which is worth noting if your detector is sensitive beyond 1.1 µm.
Key advantages
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High 525 nm throughput: ~93–95% T through the main green passband for efficient green LED illumination and imaging.
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Steep band edges: Rapid cut-on and cut-off around the ~470 nm and ~590 nm regions for clean spectral separation.
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Low out-of-band leakage (VIS–NIR): Low transmission outside the passband reduces background and improves contrast under broadband illumination.
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SWIR leakage awareness: A strong secondary window appears near ~1180–1210 nm (up to ~90–95% T); additional blocking can be added if required.
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Production-ready build: Durable dielectric coating; optional rear-surface anti-reflection and slight wedge available to suppress ghosts/flare.
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Custom formats: Borofloat®, Eagle XG or D263 T (0.21–3.8 mm) for high-temp use to ~450 °C; economical soda-lime for ≤150 °C. Custom sizes 5–450 mm.
Typical applications
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Green LED illumination: Improve contrast in machine vision and inspection systems.
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Microscopy & imaging: Clean green channel for colour separation and multi-band imaging.
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Fluorescence and bio-imaging: Isolate green emission bands while suppressing excitation and ambient spill.
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Photometry & sensing: Stable green band for reflectance/absorption measurements around 525 nm.
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Optical instruments: Spectral channel selection and stray-light control in analyzers and light engines.
Need test chips tomorrow or thousands next quarter? BBP-525 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
