BBP-485 Bandpass Filter
BBP-485 isolates the blue-cyan channel with ~88–90 % peak transmission around ~480–505 nm and near-baseline leakage across most of the visible.
- Main passband (T): ~88–90 % T @ 480 – 505 nm
- Cut-on / cut-off: Steep edges around the ~475 nm and ~510 nm regions
- Out-of-band (VIS): ~0–1 % T across ~300 – 720 nm
- Red/NIR leakage: ~55–60 % peak @ 750–760 nm; ~20–35 % shoulder @ 790–800 nm (optional 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-485 is a narrow blue-cyan bandpass centred near 485 nm, delivering
~88–90 % peak transmission in the ~480–505 nm window with steep edges for clean separation
from neighbouring colours. Outside the main passband, transmission stays near baseline (~0–1 %)
across most of ~300–720 nm, improving contrast and signal-to-noise under mixed illumination.
Note for red/NIR-sensitive detectors: secondary transmission can appear around ~740–800 nm, including a
narrow peak near 750–760 nm (up to ~55–60 %) and a broader shoulder toward 790–800 nm
(~20–35 %). If your sensor responds strongly in that region, KUPO can add an additional blocking
stack to suppress the leakage fully.
Typical uses: 485 nm excitation for fluorescence, 485 nm LED inspection lighting,
microscopy channel isolation, reflectance/absorption photometry, and blue-cyan channel selection in
instruments or light engines. 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-485 is a blue-cyan visible bandpass filter centred around ~485 nm. It delivers a narrow, high-transmission window peaking at about ~88–90% around ~480–505 nm, with steep edges that quickly suppress neighbouring wavelengths. Outside the main passband, transmission stays near the baseline across most of ~300–720 nm (generally ~0–1% T). The spectrum also shows notable secondary transmission in the deep red/NIR around ~740–800 nm, including a narrow peak near ~750–760 nm (up to ~55–60% T) plus a broader shoulder toward ~790–800 nm (~20–35% T), which is worth noting if your detector is sensitive there.
Key advantages
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High 485 nm throughput: ~88–90% T at the main passband peak for efficient 485 nm LED/laser excitation and imaging.
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Narrow band selection: Tight spectral window improves contrast by rejecting adjacent colours.
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Low out-of-band leakage (VIS): Near-baseline transmission through most of ~300–720 nm reduces background and improves signal-to-noise.
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Red/NIR leakage awareness: Secondary transmission appears around ~740–800 nm; 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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Blue-cyan excitation (fluorescence/biotech): Isolate 485 nm excitation while suppressing off-band light for higher contrast.
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485 nm LED illumination: Improve feature separation in machine vision and inspection.
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Microscopy & imaging: Clean 485 nm channel for multi-colour fluorescence and colour separation.
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Optical sensing & photometry: Stable 485 nm band for reflectance/absorption measurements.
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Spectral channel selection: Band-limited blue-cyan path in instruments and light engines.
Need test chips tomorrow or thousands next quarter? BBP-485 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
