BBP-585 Bandpass Filter
BBP-585 isolates the amber/yellow channel with ~92–94 % transmission in the ~575–605 nm band and near-baseline leakage across the rest of the visible.
- Main passband (T): ~92–94 % T @ 575 – 605 nm
- Cut-on / cut-off: Steep edges around the ~570 nm and ~610 nm regions
- Out-of-band (VIS): ~0–2 % T across ~410 – 800 nm
- UV/blue feature: ~5–20 % T @ 380 – 410 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-585 is a narrow visible bandpass centred near 585 nm, delivering
~92–94 % peak transmission across ~575–605 nm with steep edges for clean spectral
separation. Outside the main window, transmission stays near baseline (~0–2 %) across
most of the visible spectrum (~410–800 nm), reducing background and improving signal-to-noise
under mixed illumination.
Note: the spectrum may show a small secondary feature in the near-UV/blue around ~380–410 nm
(typically ~5–20 % transmission). If your source or detector is sensitive there, KUPO can add
an additional blocking stack to suppress that band.
Typical uses: 585 nm LED illumination for inspection, yellow emission isolation in
fluorescence/bio-imaging, reflectance/absorption photometry, spectral channel selection in optical
instruments, and stable 585 nm reference bands for calibration and detector testing. 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-585 is a visible bandpass filter centred around 585 nm. It delivers a narrow, high transmission peak of about ~92–94% in the ~575–605 nm region, with steep edges that quickly suppress out-of-band light. Outside the main passband, transmission stays near the baseline (generally ~0–2% across most of ~410–800 nm). The spectrum shows a small secondary transmission feature in the near-UV/blue around ~380–410 nm (peaking roughly ~5–20% T), which is worth noting if your source or detector is sensitive there.
Key advantages
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High 585 nm throughput: ~92–94% T at the main passband peak for efficient amber/yellow LED and laser use.
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Narrow band selection: Tight spectral window around ~585 nm improves contrast by rejecting neighbouring wavelengths.
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Low out-of-band leakage: Near-baseline transmission across most of the visible reduces background and improves signal-to-noise.
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Secondary band awareness: A smaller feature appears around ~380–410 nm; extra 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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585 nm LED illumination: Improve contrast for machine vision and inspection in the amber band.
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Fluorescence and bio-imaging: Isolate yellow emission bands while suppressing excitation and ambient spill.
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Photometry and sensing: Clean spectral channel for reflectance/absorption measurements around 585 nm.
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Optical instruments: Spectral channel selection and stray-light control in multi-spectral systems.
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Colour separation and calibration: Stable 585 nm reference band for imaging and detector testing.
Need test chips tomorrow or thousands next quarter? BBP-585 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
