BBP-783 Bandpass Filter
BBP-783 isolates the ~783 nm channel with ~90–92 % peak transmission and near-baseline leakage through most of the visible–NIR—built for 780–785 nm illumination and sensing.
- Main passband (T): ~90–92 % T @ ~790 – 805 nm
- Cut-on / cut-off: Steep edges around the ~780–810 nm region
- Out-of-band (VIS–NIR): ~0–2 % T across ~450 – 1100 nm
- UV/blue leak: ~30–35 % T @ 390 – 420 nm (optional extra blocking)
- SWIR window: ~65–70 % T @ 1170 – 1180 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-783 is a near-infrared bandpass centred around ~783 nm, delivering a narrow
high-transmission peak (~90–92 %) in the ~790–805 nm region with steep edges that rapidly suppress
out-of-band light. Outside the main window, transmission stays near baseline (~0–2 %) across most of
~450–1100 nm to improve signal-to-noise under mixed illumination.
Two off-band features are worth noting: a visible/near-UV leak around ~390–420 nm (up to ~30–35 % T)
and a strong SWIR window beyond ~1.15 µm (rising to ~65–70 % near ~1170–1180 nm and remaining
elevated toward ~1200 nm). If your source/detector is sensitive in those regions, KUPO can add additional
blocking stacks to suppress one or both bands.
Typical uses: 780–785 nm illumination for machine vision, reflectance/absorption sensing,
optical beacons and tracking, photometry/calibration, and industrial inspection requiring a clean
~783 nm channel. 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-783 is a precision near-infrared filter centered at 790 nm with a tight 35 nm FWHM passband (773-808 nm). Peak transmission reaches 91.7 %. This narrow filter excels at isolating the 780 nm region while permitting intentional SWIR transmission at 19.2 % - a distinctive feature for applications requiring dual-window spectral access. The visible blocking is near-complete, making this filter ideal for systems combining NIR and SWIR sensing.
Key Advantages
- Narrow spectral isolation – 35 nm FWHM provides precise wavelength filtering with minimal crosstalk from adjacent spectral regions
- Selective SWIR passband – 19.2 % SWIR transmission opens a second optical window for dual-band sensing applications
- Hard-oxide multilayer durability – Ion-assisted deposition ensures stable spectral performance across temperature swings and mechanical stress
- Flexible format options – Custom round, square, or free-form blanks sized 5 mm to 450 mm with thickness 0.21-3.8 mm
- Optical substrate variety – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG support diverse optical architectures
Typical Applications
- Dual-band sensing – NIR-SWIR combined measurements in thermal and spectroscopic instruments
- Laser-based metrology – 780 nm laser line isolation in distance and dimensional measurement systems
- Scientific instrumentation – Narrow-band photometry in optical research and analytical chemistry
- Fiber-coupled systems – Wavelength selection in telecommunications and sensor networks
- Emerging spectral imaging – Multi-spectral analysis combining visible rejection with NIR and SWIR access
Deploy BBP-783 prototypes quickly with our rapid custom manufacturing. From single-unit evaluation to volume production, we support your spectral sensing roadmap.
FAQ
BBP-783 FAQ
What is BBP-783 and what is it used for?
BBP-783 is a Narrow near-infrared bandpass with selective SWIR transparency. The BBP-783 is a precision near-infrared filter centered at 790 nm with a tight 35 nm FWHM passband (773-808 nm). Peak transmission reaches 91.7 %. Common uses include Dual-band sensing, Laser-based metrology, Scientific instrumentation, and Fiber-coupled systems.
What are the key optical specs of BBP-783?
Key published specs for BBP-783 include Centre wavelength (CWL): 790.2 nm; Bandwidth (FWHM): 36.4 nm; Peak transmittance: ≥ 91.7 % T; Passband range: 772 – 808 nm; Edge steepness: ~14 nm (10 → 90 % per edge).
What applications is BBP-783 best suited for?
BBP-783 is commonly used for Dual-band sensing, Laser-based metrology, Scientific instrumentation, and Fiber-coupled systems. Dual-band sensing - NIR-SWIR combined measurements in thermal and spectroscopic instruments.
Can BBP-783 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-783 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. Flexible format options - Custom round, square, or free-form blanks sized 5 mm to 450 mm with thickness 0.21-3.8 mm.
What should I know about angle of incidence and durability for BBP-783?
The published angle of incidence for BBP-783 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
