BH-A03 Broad Bandpass Filter
Narrow-band orange-red filter centred at 638 nm with 79 nm bandwidth for precise wavelength isolation in imaging, spectroscopy, and fluorescence applications.
- Centre wavelength (CWL): 638 nm
- Bandwidth (FWHM): 79 nm
- Peak transmittance: ≥ 92.8 % T
- Short-wave edge (T50): ≈ 598 nm
- Long-wave edge (T50): ≈ 677 nm
- Out-of-band blocking: OD ≥ 0.7 (200 – 1100 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: CWL tuning, bandwidth adjustment, custom blocking range, rapid prototypes
Learn more
BH-A03 Bandpass delivers Centre wavelength (CWL) 638 nm, Bandwidth (FWHM) 79 nm, and Peak transmittance ≥ 92.8 % T.
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Fluorescence microscopy and flow cytometry where isolating the orange-red emission band with a narrow 79 nm passband maximises signal collection while rejecting excitation light and adjacent channel crosstalk
Description
The BH-A03 is a deep-red bandpass filter engineered to isolate the critical 603-700 nm spectral region with peak transmission of 92.8 % at 616 nm. This specialized filter delivers exceptional selectivity by suppressing all ultraviolet, blue, and green wavelengths below 5 % while maintaining strong red transmission throughout the 603-700 nm window. The BH-A03 excels in applications requiring monochromatic or near-monochromatic red light delivery---particularly those using deep-red fluorophores, semiconductor lasers, or thermal imaging sensors sensitive to the 650 nm band. Extended NIR transmission (4 % 700-1000 nm) with controlled SWIR roll-off (36 %) provides additional flexibility for multi-wavelength system design.
Key Advantages
- Narrow Red Bandpass - Centered at 616 nm with >80 % transmission spanning 603-700 nm, isolating deep-red emissions while rejecting adjacent spectral regions for spectrally pure detection.
- Complete UV-Blue-Green Rejection - \<5 % transmission below 603 nm eliminates stray visible light and fluorescence noise that would otherwise overwhelm weakly fluorescent red markers.
- Optimized for 650nm Laser Lines - Peak response centered near standard 650 nm diode laser wavelengths, maximizing beam transmission while rejecting pump light and thermal background.
- Hard-Oxide Ion-Assisted Coating - Durable multilayer coating withstands laser irradiance, thermal cycling, and high-humidity environments without spectral drift or coating degradation.
- Custom Format Flexibility - Available in round, square, and free-form formats from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrates.
Typical Applications
- Deep-Red Fluorescence Detection - Isolates 650 nm fluorophore emissions (Alexa Fluor 633, Texas Red) from autofluorescence and bleed-through signal, boosting sensitivity in multiplex assays.
- 650nm Laser Coupling - Matches peak transmission to standard 650 nm diode laser wavelengths, efficiently coupling beam into fiber-coupled detection and illumination systems.
- Thermal Imaging - Passes thermal radiation signatures peaking near 650 nm while blocking visible ambient light and shorter-wavelength noise sources.
- Industrial Vision Sorting - Enables deep-red monochromatic imaging for color-based material sorting and defect detection in manufacturing environments.
- Biomedical Sensing - Isolates 650 nm responses in reflectance pulse oximetry and tissue optics measurements where oxyhemoglobin transitions dominate.
Integrate the BH-A03 650nm Red Pass filter into your red-light imaging system with our rapid prototyping service and full manufacturing capability.
FAQ
BH-A03 FAQ
What is BH-A03 and what is it used for?
BH-A03 is a 650nm Red Pass. The BH-A03 is a deep-red bandpass filter engineered to isolate the critical 603-700 nm spectral region with peak transmission of 92.8 % at 616 nm. This specialized filter delivers exceptional selectivity by suppressing all ultraviolet, blue, and green wavelengths below 5 % while maintaining strong red transmission throughout the 603-700 nm window. Common uses include Deep-Red Fluorescence Detection, 650nm Laser Coupling, Thermal Imaging, and Industrial Vision Sorting.
What are the key optical specs of BH-A03?
Key published specs for BH-A03 include Centre wavelength (CWL): 638 nm; Bandwidth (FWHM): 79 nm; Peak transmittance: ≥ 92.8 % T; Short-wave edge (T50): ≈ 598 nm; Long-wave edge (T50): ≈ 677 nm.
What applications is BH-A03 best suited for?
BH-A03 is commonly used for Deep-Red Fluorescence Detection, 650nm Laser Coupling, Thermal Imaging, and Industrial Vision Sorting. Deep-Red Fluorescence Detection - Isolates 650 nm fluorophore emissions (Alexa Fluor 633, Texas Red) from autofluorescence and bleed-through signal, boosting sensitivity in multiplex assays.
Can BH-A03 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BH-A03 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include CWL tuning, bandwidth adjustment, custom blocking range, rapid prototypes. Optimized for 650nm Laser Lines - Peak response centered near standard 650 nm diode laser wavelengths, maximizing beam transmission while rejecting pump light and thermal background.
What should I know about angle of incidence and durability for BH-A03?
The published angle of incidence for BH-A03 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
