BH-A13 Red Transmission Mirror
Wide-passband filter transmitting a broad red window (597 – 747 nm) with steep edges and deep blocking on both sides for clean spectral isolation.
- Passband: 597 – 747 nm
- Bandwidth (FWHM): ~741 nm
- Centre wavelength: ~730 nm (nominal)
- Passband transmittance: ≥ 88.9 % T (± 9.9 % ripple)
- Short-wave edge (T50): ≈ 359 nm, ~293 nm steepness
- Long-wave edge (T50): ≈ 1100 nm, ~353 nm steepness
- Short-wave blocking: OD ≥ 0.4 below 329 nm
- Long-wave blocking: OD ≥ 2.0 above 1130 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-A13 Bandpass Extended delivers Passband 597 – 747 nm, Bandwidth (FWHM) ~741 nm, and Centre wavelength ~730 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-A13 Red Transmit Mirror (RTM) is a color-selective optical element optimized for red light isolation across the 592-857 nm band, achieving peak transmission of 98.8 % at 690 nm. This specialized color mirror blocks blue wavelengths completely (\<5 % at 400-500 nm: 1.5 %) and suppresses deep green (25 %) while maintaining exceptional red transmission throughout the red pass-band. Extended NIR transmission (73 %) and strong SWIR response (71 %) enable system designs combining red fluorescence detection with thermal infrared components. The BH-A13 is essential for red laser systems, mCherry/Alexa 647 fluorophores, and clinical diagnostics requiring isolated red-channel detection.
Key Advantages
- Peak Red Transmission - 98.8 % transmission at 690 nm with sustained >80 % across 592-857 nm provides unmatched red fluorophore and laser signal delivery.
- Complete Blue Rejection - 1.5 % transmission across 400-500 nm eliminates blue excitation crosstalk and prevents interference from blue autofluorescence.
- Selective Green Blocking - 25 % transmission of deep green allows green background measurement while effectively preventing green-channel crosstalk.
- Hard-Oxide Ion-Assisted Coating - Multilayer hard-oxide design withstands high-intensity red laser irradiance and maintains spectral performance across thermal and environmental stress.
- Custom Format Flexibility - Round, square, and free-form formats from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrate options.
Typical Applications
- mCherry/RFP Fluorescence Microscopy - Transmits 600-650 nm red fluorophore emissions while blocking blue excitation and green crosstalk for high-contrast cellular imaging.
- Alexa Fluor 647/660 Detection - Isolates far-red fluorophore signals in multiplex assays and super-resolution microscopy, enabling detection of weakly fluorescent markers.
- Red Laser Coupling - Couples 633-680 nm laser lines into detection pathways while rejecting blue and green pump light in fiber-coupled illumination systems.
- Clinical Fluorescence Imaging - Red fluorophore detection in endoscopy, dermatology, and intraoperative guidance systems using FDA-approved red dyes.
- Dual-Color NIR Imaging - Enables simultaneous red and near-infrared detection by transmitting both red fluorescence and thermal background signals.
Deploy the BH-A13 Red Transmit Mirror in your red fluorescence detection system with rapid prototyping and production capability.
FAQ
BH-A13 FAQ
What is BH-A13 and what is it used for?
BH-A13 is a RTM - Red Transmit Mirror. The BH-A13 Red Transmit Mirror (RTM) is a color-selective optical element optimized for red light isolation across the 592-857 nm band, achieving peak transmission of 98.8 % at 690 nm. This specialized color mirror blocks blue wavelengths completely (<5 % at 400-500 nm: 1.5 %) and suppresses deep green (25 %) while maintaining exceptional red transmission throughout the red pass-band. Common uses include mCherry/RFP Fluorescence Microscopy, Alexa Fluor 647/660 Detection, Red Laser Coupling, and Clinical Fluorescence Imaging.
What are the key optical specs of BH-A13?
Key published specs for BH-A13 include Passband: 597 – 747 nm; Bandwidth (FWHM): ~741 nm; Centre wavelength: ~730 nm (nominal); Passband transmittance: ≥ 88.9 % T (± 9.9 % ripple); Short-wave edge (T50): ≈ 359 nm, ~293 nm steepness.
What applications is BH-A13 best suited for?
BH-A13 is commonly used for mCherry/RFP Fluorescence Microscopy, Alexa Fluor 647/660 Detection, Red Laser Coupling, and Clinical Fluorescence Imaging. mCherry/RFP Fluorescence Microscopy - Transmits 600-650 nm red fluorophore emissions while blocking blue excitation and green crosstalk for high-contrast cellular imaging.
Can BH-A13 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BH-A13 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. Selective Green Blocking - 25 % transmission of deep green allows green background measurement while effectively preventing green-channel crosstalk.
What should I know about angle of incidence and durability for BH-A13?
The published angle of incidence for BH-A13 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
