B11812 Shortpass Filter
Green-yellow shortpass for display calibration and colour-accurate optical systems.
- Passband: 396 – 539 nm, 90.3 – 95.5 % T (± 2.6 % ripple)
- Cut-off (T50): ≈ 548 nm
- Edge steepness: ~22 nm (90 → 10 % transition)
- Blocking: < 0.97 % T above 584 nm (OD ≥ 2)
- 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 tuning, ripple smoothing, 45° AOI, rapid prototypes
Learn more
B11812 Hybrid delivers Passband 396 – 539 nm, 90.3 – 95.5 % T (± 2.6 % ripple), Cut-off (T50) ≈ 548 nm, and Edge steepness ~22 nm (90 → 10 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Display colour calibration, professional imaging, RGB sensor systems, colour management.
Description
The B11812 passes the green-to-yellow-green spectrum with its 50 % cut-off measured at 581 nm. Transmission averages above 90 % from 430 to 570 nm, peaking at 93.1 % near 500 nm, providing wide coverage from the blue-green to the yellow-green boundary. Beyond the transition edge, the filter suppresses transmission to below 1 % by 598 nm and maintains sub-0.5 % blocking on average from 598 nm to 780 nm – a clean, deep rejection floor across the orange-to-NIR region.
Key Advantages
- Precise 581 nm cut-off – T50 % measured at 581.2 nm with a transition that drops to < 1 % within 17 nm, cleanly separating the green passband from orange and longer wavelengths.
- High-throughput passband – Average transmission above 90 % across 430–570 nm with a 93.1 % peak, minimizing signal loss across the wide blue-to-yellow-green range.
- Broadband blocking – Sub-0.5 % average transmission from 598 nm to 780 nm, ensuring reliable rejection of orange, red, and NIR wavelengths.
- Hard-oxide durability – Ion-assisted sputtered hard coating withstands heat, humidity, solvents, and frequent cleaning cycles.
- Custom formats – Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21–3.8 mm, on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG substrates.
Typical Applications
- Fluorescence excitation filtering – Passes excitation bands for YFP, mVenus, and Alexa Fluor 546 while blocking orange emission wavelengths above 580 nm.
- Multi-channel microscopy – Defines a wide green detection channel in multi-color imaging systems, preventing cross-talk with red or far-red detection channels.
- Laser line clean-up – Removes broadband ASE from 532–568 nm laser sources, passing spectrally pure emission below the 580 nm edge.
- Machine vision – Isolates green LED illumination in automated inspection systems requiring rejection of orange and red ambient light.
- Architectural & stage lighting – Produces a vivid lime-green wash from broadband sources with no orange, red, or warm-tone contamination.
Need a 590 nm shortpass tailored to your optical path? KUPO Optics provides rapid prototyping and volume production to your exact size, shape, and substrate specifications.
FAQ
B11812 FAQ
What is B11812 and what is it used for?
B11812 is a 550 nm Shortpass Filter. The B11812 transmits UV through the full green spectrum with its 50 % cut-off measured at 548.3 nm. The passband is notably bright, peaking at 95.5 % near 512 nm with average transmission above 93 % from 386 to 542 nm. Common uses include Green fluorescence detection, Tristimulus colorimetry, Machine vision inspection, and Environmental monitoring.
What are the key optical specs of B11812?
Key published specs for B11812 include Passband: 396 – 539 nm, 90.3 – 95.5 % T (± 2.6 % ripple); Cut-off (T50): ≈ 548 nm; Edge steepness: ~22 nm (90 → 10 % transition); Blocking: < 0.97 % T above 584 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is B11812 best suited for?
B11812 is commonly used for Green fluorescence detection, Tristimulus colorimetry, Machine vision inspection, and Environmental monitoring. Green fluorescence detection - Passes the full GFP/YFP excitation and emission window while blocking orange, red, and NIR background - ideal for fluorescence microscopy.
Can B11812 be customized for size, substrate, or coating requirements?
KUPO lists the construction for B11812 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Edge tuning, ripple smoothing, 45° AOI, rapid prototypes. Custom formats - Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG glass.
What should I know about angle of incidence and durability for B11812?
The published angle of incidence for B11812 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
