Dichroic splitter for 45 ° AOI: passes 410 – 525 nm blue-green while reflecting > 98 % of 610 – 740 nm red—perfect for colour-clean beam routing.
BH-A09 is KUPO’s precision blue-green pass / red mirror coating for 45 °
incidence. Reflectance plunges below 5 % between 410 nm and 525 nm, letting
cyan-green light race through with virtually no loss. Just 65 nm farther into the
spectrum the curve rockets past 90 % and settles above 98 % from 610 nm to 740 nm,
providing a near-lossless reflector for red lasers, LEDs, or broadband sources.
Steeper slopes at both edges keep colour cross-talk below 1 %, ideal for
dual-path fluorescence microscopes, RGB projection engines, and laser beam
combiners.
The dense ion-beam-sputtered stack shrugs off solvents, humidity, and thermal
cycling while maintaining batch-to-batch spectral repeatability within ± 2 nm.
Standard substrates include Borofloat®, Corning Eagle XG, Schott D 263 T, and
fused silica, sized up to 450 mm with thicknesses from 0.5 mm to 3 mm.
Options such as back-side AR, wedged blanks, or edge-shift tuning ship in as
little as ten days for prototype runs.
Typical uses: split red emission from cyan/green excitation in fluorescence,
merge 633 nm He-Ne with 488 nm argon lines in multi-colour laser rigs, isolate red
channels in RGB projectors, or redirect NIR heat away from sensitive sensors while
passing visible light to the detector.
High-Fidelity Color Separation – A sharp spectral transition between the transmission and reflection bands ensures minimal color cross-contamination and high-purity output beams.
Exceptional Red-Band Reflection – Over 98% reflectance in the critical 610–740 nm range allows for near-lossless redirection of red lasers, LEDs, and filtered light sources.
Broad Blue-Green Transmission – The wide, low-reflectance passband from 410 nm to 525 nm allows for maximum throughput of desired cyan and green wavelengths.
Durable, Stable Performance – A hard, dense dielectric coating provides excellent resistance to environmental factors and repeated cleaning, ensuring a long and reliable service life.
Low-Scatter, High-Quality Substrate – Built on a precision-polished, λ/10 substrate, the BH-A09 maintains wavefront integrity for imaging, laser, and sensor applications.
Rapid Customisation – KUPO stocks standard sizes for immediate prototyping, and our engineers can rapidly develop custom shapes, substrates, or performance-tuned designs to meet your specific needs.
Fluorescence Microscopy & Instrumentation – Separate longer-wavelength red emission signals from shorter-wavelength cyan/green excitation light with high efficiency.
Laser Beam Combining & Splitting – Merge or divide red laser lines (e.g., HeNe at 633 nm) with argon-ion or other blue/green lasers in multi-wavelength systems.
RGB Projection & Display Systems – Isolate the red channel from blue and green channels in a light engine, improving color purity and contrast.
Entertainment & Laser Shows – Used as a primary color filter or splitter to create vivid, saturated red effects from a broadband white light source.
Photometry & Colorimetry – Isolate distinct spectral regions to enable precise measurement and analysis with dedicated sensors.
Need to fine-tune the cut-on wavelength, add an anti-reflection coating to the back surface, or integrate this coating into a larger optical assembly? Talk to KUPO Optics today—our engineering team can tailor BH-A09 to your optical path and ship prototype parts fast.