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
The BBP-485 is a narrow blue-cyan filter centered at 487 nm with a tight 27 nm FWHM passband (472-499 nm). Peak transmission reaches 90.6 %. This precise blue isolation minimizes green crosstalk while maintaining strong signal. An interesting characteristic is the 19.3 % NIR leakage - a feature beneficial for applications requiring simultaneous blue and near-infrared sensing through a single optical element.
Key Advantages
- Precise blue isolation – 27 nm FWHM cleanly separates blue signal from green and red wavelengths with minimal overlap
- Dual-band NIR access – 19.3 % NIR transmission enables simultaneous blue and near-infrared measurement in integrated designs
- Hard-oxide multilayer durability – Ion-assisted deposition provides stable performance across temperature ranges 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
- Multiple substrate grades – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG support your optical architecture
Typical Applications
- Blue LED imaging – Machine vision systems using 470-490 nm LED illumination for precise color detection
- Fluorescence microscopy – Blue excitation isolation in biomedical and life-sciences fluorescence imaging
- Ocean color sensing – Chlorophyll and water quality measurement in environmental monitoring systems
- Dual-band sensing – Combined blue and NIR measurements for advanced material inspection and sorting
- Scientific instrumentation – Narrow-band photometry in optical research and analytical applications
Accelerate your blue-channel application with BBP-485 prototypes available in weeks. Rapid custom manufacturing supports both development and high-volume deployment.
FAQ
BBP-485 FAQ
What is BBP-485 and what is it used for?
BBP-485 is a Narrow blue-cyan bandpass with NIR transparency. The BBP-485 is a narrow blue-cyan filter centered at 487 nm with a tight 27 nm FWHM passband (472-499 nm). Peak transmission reaches 90.6 %. Common uses include Blue LED imaging, Fluorescence microscopy, Ocean color sensing, and Dual-band sensing.
What are the key optical specs of BBP-485?
Key published specs for BBP-485 include Centre wavelength (CWL): 486 nm; Bandwidth (FWHM): 28.1 nm; Peak transmittance: ≥ 90.6 % T; Passband range: 472 – 500 nm; Edge steepness: ~11 nm (10 → 90 % per edge).
What applications is BBP-485 best suited for?
BBP-485 is commonly used for Blue LED imaging, Fluorescence microscopy, Ocean color sensing, and Dual-band sensing. Blue LED imaging - Machine vision systems using 470-490 nm LED illumination for precise color detection.
Can BBP-485 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-485 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-485?
The published angle of incidence for BBP-485 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
