BBP-730 Bandpass Filter
BBP-730 isolates the 730 nm channel with ~96–99 % throughput across ~690–760 nm and near-baseline leakage elsewhere—ideal for sensing and controlled NIR imaging.
- Main passband (T): ~96–99 % T @ 690 – 760 nm
- Cut-on / cut-off: Steep edges near ~680 nm and ~770 nm
- Out-of-band (VIS–NIR): ~0–2 % T across 300 – 680 nm
- Out-of-band (NIR): ~0–2 % T across 780 – 1100 nm
- SWIR peak: ~80–85 % T @ 1180 – 1200 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-730 is a near-infrared bandpass centred around 730 nm, delivering
~96–99 % transmission across ~690–760 nm with steep edges that rapidly suppress
out-of-band light. Outside the main window, transmission stays near baseline (~0–2 %)
across most of the visible and near-IR (300–680 nm and ~780–1100 nm), improving
contrast under mixed illumination.
Note for SWIR-sensitive detectors: a strong secondary transmission peak can appear near
~1180–1200 nm and reach ~80–85 % transmission. If your sensor responds beyond
1.1 µm, KUPO can add an additional blocking stack to fully suppress this SWIR band.
Typical uses: 730 nm illumination for machine vision, reflectance/absorption sensing,
vegetation-index research, photometry and detector calibration, and industrial inspection where
a clean 730 nm channel is required. 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-730 is a near-infrared bandpass filter centred around 730 nm. It delivers a high transmission window of about ~96–99% from roughly ~690–760 nm, 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 300–680 nm and ~780–1100 nm), with small residual ripples. The spectrum also shows a pronounced secondary transmission peak in the SWIR near ~1180–1200 nm (peaking around ~80–85% T), which is worth noting for detectors sensitive beyond 1.1 µm.
Key advantages
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High 730 nm throughput: ~96–99% T across ~690–760 nm for efficient 730 nm LED/laser use.
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Steep band edges: Rapid cut-on and cut-off around the ~680 nm and ~770 nm regions for clean spectral separation.
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Low out-of-band leakage (VIS–NIR): Near-baseline transmission across most of 300–680 nm and ~780–1100 nm reduces background and improves contrast.
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SWIR leakage awareness: A strong secondary peak appears near ~1180–1200 nm (up to ~80–85% 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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730 nm illumination: Improve signal-to-background for machine vision and controlled IR imaging.
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Biometrics and sensing: Isolate the 730 nm channel for reflectance and absorption measurements.
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Agriculture and vegetation indices: Band-select near 730 nm for plant reflectance contrast studies.
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Optical photometry: Clean spectral window for calibration and detector testing.
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Industrial inspection: Reduce broadband glare while preserving the 730 nm working wavelength.
Need test chips tomorrow or thousands next quarter? BBP-730 filters are coated and cut-to-size (including dicing) to your exact spec—fast.
