BBP-765 Bandpass Filter
BBP-765 isolates the 765 nm channel with ~96–99 % throughput across ~740–800 nm and near-baseline leakage elsewhere—ideal for sensing and controlled NIR imaging.
- Main passband (T): ~96–99 % T @ 740 – 800 nm
- Cut-on / cut-off: Steep edges near ~730 nm and ~810 nm
- Out-of-band (VIS–NIR): ~0–2 % T across 300 – 720 nm
- Out-of-band (NIR): ~0–2 % T across 820 – 1100 nm
- SWIR tail: ~50–70 % T by ~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-765 is a near-infrared bandpass centred around 765 nm, delivering
~96–99 % transmission across ~740–800 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 (300–720 nm and ~820–1100 nm), improving
contrast under mixed illumination.
Note for SWIR-sensitive detectors: transmission can rise again beyond ~1.15 µm and reach
~50–70 % by ~1.2 µm. If your sensor responds in that range, KUPO can add an
additional blocking stack to fully suppress the SWIR tail.
Typical uses: 765 nm illumination for machine vision, reflectance/absorption sensing,
vegetation-index research, photometry and detector calibration, and industrial inspection where
a clean 765 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
The BBP-765 is a near-infrared filter centered at 774 nm with a 70 nm FWHM passband (736-806 nm). Peak transmission reaches 98.9 % - outstanding optical efficiency that approaches theoretical limits. This filter isolates the 750-800 nm window with minimal loss, providing maximum signal throughput. The 18.8 % SWIR leakage enables optional thermal sensing for applications combining visible rejection with NIR and SWIR measurement.
Key Advantages
- Near-maximum transmission – 98.9 % peak efficiency means virtually no optical losses - highest possible signal throughput
- Precise 750-800 nm isolation – 70 nm FWHM provides clean 750-800 nm passband with excellent visible blocking
- Hard-oxide ion-assisted coating – Dichroic multilayer design ensures stable performance across thermal extremes and environmental stress
- Custom blank options – Round, square, and free-form formats from 5 mm to 450 mm with thickness 0.21-3.8 mm
- Diverse substrate selection – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG support your optical requirements
Typical Applications
- Ultra-low-loss imaging – Maximum light collection where optical efficiency is critical to system performance
- Scientific photometry – Precision spectroscopic and photometric measurements in 750-800 nm band
- Biomedical research – Tissue optics and non-invasive diagnostic measurements requiring high signal efficiency
- Thermal-visible fusion – High-efficiency NIR primary channel with secondary SWIR access for multi-spectral imaging
- Fiber optics – Wavelength-specific filtering in fiber-based telecommunications and sensor networks
Integrate BBP-765 into your high-efficiency NIR application with rapid custom prototyping. We support development through high-volume manufacturing deployment.
FAQ
BBP-765 FAQ
What is BBP-765 and what is it used for?
BBP-765 is a Near-infrared bandpass with near-99 % peak transmission. The BBP-765 is a near-infrared filter centered at 774 nm with a 70 nm FWHM passband (736-806 nm). Peak transmission reaches 98.9 % - outstanding optical efficiency that approaches theoretical limits. Common uses include Ultra-low-loss imaging, Scientific photometry, Biomedical research, and Thermal-visible fusion.
What are the key optical specs of BBP-765?
Key published specs for BBP-765 include Centre wavelength (CWL): 770.8 nm; Bandwidth (FWHM): 70.6 nm; Peak transmittance: ≥ 98.9 % T; Passband range: 735 – 806 nm; Edge steepness: ~19 nm (10 → 90 % per edge).
What applications is BBP-765 best suited for?
BBP-765 is commonly used for Ultra-low-loss imaging, Scientific photometry, Biomedical research, and Thermal-visible fusion. Ultra-low-loss imaging - Maximum light collection where optical efficiency is critical to system performance.
Can BBP-765 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-765 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. Custom blank options - Round, square, and free-form formats from 5 mm to 450 mm with thickness 0.21-3.8 mm.
What should I know about angle of incidence and durability for BBP-765?
The published angle of incidence for BBP-765 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
