BH-A02 UV-IR Cut Filter
Wide-passband filter transmitting a broad red window (423 – 1020 nm) with steep edges and deep blocking on both sides for clean spectral isolation.
- Passband: 423 – 1020 nm
- Bandwidth (FWHM): ~620 nm
- Centre wavelength: ~725 nm (nominal)
- Passband transmittance: ≥ 89.4 % T (± 9.9 % ripple)
- Short-wave edge (T50): ≈ 415 nm, ~16 nm steepness
- Long-wave edge (T50): ≈ 1035 nm, ~80 nm steepness
- Short-wave blocking: OD ≥ 2.8 below 385 nm
- Long-wave blocking: OD ≥ 0.5 above 1065 nm
- AOI: 0° (normal incidence); custom angles available
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Edge shifting, passband widening/narrowing, asymmetric blocking, rapid prototypes
Learn more
BH-A02 Bandpass Extended delivers Passband 423 – 1020 nm, Bandwidth (FWHM) ~620 nm, and Centre wavelength ~725 nm (nominal).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Near-infrared imaging and sensing applications — including silicon-sensor camera systems, LIDAR receivers, and night-vision optics — where the wide NIR passband maximises signal collection across the sensor's peak sensitivity range
Description
The BH-A02 UV-IR Cut filter delivers ultra-high visible transmission while simultaneously eliminating UV contamination and near-infrared noise. With peak transmission of 99.4 % at 686 nm and sustained >80 % transmission across the 420-700 nm visible window, this filter represents the most efficient visible pass-band in the series. Ultraviolet rejection falls below 1 % (300-400 nm), while NIR suppression remains below 5 % (700-971 nm). The BH-A02 is the optimal choice for applications demanding maximum visible light throughput with complete spectral hygiene, eliminating false signals and noise sources that compromise optical system performance.
Key Advantages
- Ultra-High Visible Transmission - Peak 99.4 % transmission at 686 nm with Blue: 82 %, Green: 98 %, Red: 98 % ensures maximum photon delivery with minimal optical loss.
- Complete UV Blocking - \<1 % transmission across 300-400 nm eliminates UV contamination, stray fluorescence, and false signals that degrade image quality in sensitive detection systems.
- Efficient NIR Suppression - \<5 % transmission from 700-971 nm removes thermal and near-infrared noise while preserving all useful visible wavelengths for downstream analysis.
- Hard-Oxide Ion-Assisted Coating - Multilayer hard-oxide design provides exceptional resistance to environmental stress, thermal shock, and mechanical handling in demanding laboratory and field conditions.
- Custom Format Flexibility - Round, square, and free-form geometries available from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrate options.
Typical Applications
- Color Digital Imaging - Delivers spectrally clean visible light to CCD/CMOS sensors, preventing UV-induced dark current and NIR thermal noise from degrading color accuracy.
- Confocal Microscopy - Removes UV autofluorescence and NIR background, dramatically improving signal-to-noise ratio and enabling detection of weakly fluorescent biological markers.
- Spectrophotometry - Isolates the visible measurement window (400-700 nm) from UV stray light and NIR thermal artifacts for accurate absorbance and transmission measurements.
- Flow Cytometry - Filters excitation and emission pathways to maximize signal from fluorescent labels while rejecting scattered UV and thermal background.
- Ambient Light Filtering - Passes visible ambient light while removing UV skin-damage wavelengths and infrared thermal radiation in outdoor and variable-lighting applications.
Deploy the BH-A02 UV-IR Cut filter with our proven rapid prototyping process and full-scale production capability to immediately enhance your optical system's spectral purity.
FAQ
BH-A02 FAQ
What is BH-A02 and what is it used for?
BH-A02 is a UV-IR Cut. The BH-A02 UV-IR Cut filter delivers ultra-high visible transmission while simultaneously eliminating UV contamination and near-infrared noise. With peak transmission of 99.4 % at 686 nm and sustained >80 % transmission across the 420-700 nm visible window, this filter represents the most efficient visible pass-band in the series. Common uses include Color Digital Imaging, Confocal Microscopy, Spectrophotometry, and Flow Cytometry.
What are the key optical specs of BH-A02?
Key published specs for BH-A02 include Passband: 423 – 1020 nm; Bandwidth (FWHM): ~620 nm; Centre wavelength: ~725 nm (nominal); Passband transmittance: ≥ 89.4 % T (± 9.9 % ripple); Short-wave edge (T50): ≈ 415 nm, ~16 nm steepness.
What applications is BH-A02 best suited for?
BH-A02 is commonly used for Color Digital Imaging, Confocal Microscopy, Spectrophotometry, and Flow Cytometry. Color Digital Imaging - Delivers spectrally clean visible light to CCD/CMOS sensors, preventing UV-induced dark current and NIR thermal noise from degrading color accuracy.
Can BH-A02 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BH-A02 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Edge shifting, passband widening/narrowing, asymmetric blocking, rapid prototypes. Custom Format Flexibility - Round, square, and free-form geometries available from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrate options.
What should I know about angle of incidence and durability for BH-A02?
The published angle of incidence for BH-A02 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
