BH-A17 Bandpass filter
Specialty optical filter with unique spectral characteristics tailored for application-specific wavelength control and signal optimisation.
- Average transmittance: ~0.8 % T (visible range)
- Peak transmittance: ~21.0 % T near 395 nm
- Minimum transmittance: ~0.0 % T near 466 nm
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Spectral tuning, substrate selection, custom sizes, rapid prototypes
Learn more
BH-A17 Specialty delivers Average transmittance ~0.8 % T (visible range), Peak transmittance ~21.0 % T near 395 nm, and Minimum transmittance ~0.0 % T near 466 nm.
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Custom optical systems with application-specific spectral requirements that cannot be met by standard off-the-shelf filter designs
Description
The BH-A17 is an extremely selective narrow-bandpass filter optimized for the 850 nm near-infrared wavelength, delivering peak transmission of 94.1 % at 828 nm across a remarkably tight 27 nm bandwidth (815-842 nm). This precision filter blocks all competing wavelengths below 5 % throughout the visible spectrum (300-1186 nm), making it essential for applications requiring monochromatic 850 nm light isolation from broadband sources. The BH-A17 eliminates visible background, thermal noise, and adjacent infrared signals that would otherwise overwhelm weak 850 nm signals in depth sensing, spectroscopy, and biometric systems. This ultra-selective specification represents the highest optical discrimination in the BH-A series.
Key Advantages
- Extreme Wavelength Selectivity - 27 nm bandwidth (815-842 nm) provides unmatched 850 nm isolation, rejecting 99 % of visible, ultraviolet, and infrared background noise.
- Peak Transmission Performance - 94.1 % transmission at 828 nm ensures excellent photon delivery within the narrow pass-band, maximizing 850 nm signal strength.
- Complete Visible Rejection - \<5 % transmission across 300-1186 nm blocks all visible ambient light, stray excitation, and thermal radiation competing with 850 nm signal.
- Hard-Oxide Ion-Assisted Coating - Multilayer hard-oxide construction delivers superior durability and spectral stability across temperature extremes and mechanical stress.
- Custom Format Flexibility - Round, square, and free-form geometries from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrates.
Typical Applications
- Narrowband 850nm Spectroscopy - Isolates 850 nm absorption signatures from broadband sources, enabling precise material analysis and biochemical sensing without false signals.
- Time-of-Flight Depth Sensing - Extremely narrow bandwidth maximizes 850 nm photon efficiency in depth and ranging systems, improving distance resolution and accuracy.
- NIR Optical Biosensing - 850 nm isolation from broadband infrared reduces background noise in label-free biosensors and optical coherence tomography systems.
- OCT System Wavelength Filtering - Ultra-narrow 850 nm pass-band maximizes coherence length and reduces sidebands in optical coherence tomography imaging.
- Hyperspectral NIR Imaging - Sequential 850 nm isolation from broadband NIR sources enables narrow-wavelength spectral imaging with minimal background.
Implement the BH-A17 850nm NIR Bandpass filter for extreme wavelength selectivity with our rapid prototyping and production capability.
FAQ
BH-A17 FAQ
What is BH-A17 and what is it used for?
BH-A17 is a 850nm NIR Bandpass. The BH-A17 is an extremely selective narrow-bandpass filter optimized for the 850 nm near-infrared wavelength, delivering peak transmission of 94.1 % at 828 nm across a remarkably tight 27 nm bandwidth (815-842 nm). This precision filter blocks all competing wavelengths below 5 % throughout the visible spectrum (300-1186 nm), making it essential for applications requiring monochromatic 850 nm light isolation from broadband sources. Common uses include Narrowband 850nm Spectroscopy, Time-of-Flight Depth Sensing, NIR Optical Biosensing, and OCT System Wavelength Filtering.
What are the key optical specs of BH-A17?
Key published specs for BH-A17 include Average transmittance: ~0.8 % T (visible range); Peak transmittance: ~21.0 % T near 395 nm; Minimum transmittance: ~0.0 % T near 466 nm; Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick; Custom options: Spectral tuning, substrate selection, custom sizes, rapid prototypes.
What applications is BH-A17 best suited for?
BH-A17 is commonly used for Narrowband 850nm Spectroscopy, Time-of-Flight Depth Sensing, NIR Optical Biosensing, and OCT System Wavelength Filtering. Narrowband 850nm Spectroscopy - Isolates 850 nm absorption signatures from broadband sources, enabling precise material analysis and biochemical sensing without false signals.
Can BH-A17 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BH-A17 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Spectral tuning, substrate selection, custom sizes, rapid prototypes. Extreme Wavelength Selectivity - 27 nm bandwidth (815-842 nm) provides unmatched 850 nm isolation, rejecting 99 % of visible, ultraviolet, and infrared background noise.
What should I know about angle of incidence and durability for BH-A17?
The hard-oxide coating is built for repeated handling, heat, and cleaning.
