B19506 Shortpass Filter
Precise blue-cyan edge for sharp channel separation and contamination-free green blocking.
- Passband: 414 – 480 nm, 90.1 – 93.2 % T (± 1.6 % ripple)
- Cut-off (T50): ≈ 486 nm
- Edge steepness: ~11 nm (90 → 10 % transition)
- Blocking: < 0.98 % T above 500 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
B19506 Hybrid delivers Passband 414 – 480 nm, 90.1 – 93.2 % T (± 1.6 % ripple), Cut-off (T50) ≈ 486 nm, and Edge steepness ~11 nm (90 → 10 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
High-sensitivity fluorescence detection, narrow-band imaging, precision optical multiplexing, confocal systems.
Description
The B19506 passes the blue and cyan spectrum with its 50 % cut-off measured at 511 nm. Transmission averages above 90 % from 400 to 500 nm, peaking at 93.4 % near 458 nm, delivering bright throughput across the blue-to-cyan window. Beyond the transition edge, the filter suppresses transmission to below 1 % by 526 nm and maintains sub-0.5 % blocking on average from 526 nm to 780 nm – a clean, wide rejection floor across the green-to-NIR region.
Key Advantages
- Precise 511 nm cut-off – T50 % measured at 511.2 nm with a transition that drops to < 1 % within 15 nm, cleanly separating the blue-cyan passband from green wavelengths.
- High-throughput passband – Average transmission above 90 % across 400–500 nm with a 93.4 % peak, minimizing signal loss across the blue-to-cyan range.
- Broadband blocking – Sub-0.5 % average transmission from 526 nm to 780 nm, ensuring reliable rejection of green, yellow, 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 the full excitation band for CFP, Alexa Fluor 488, and similar cyan-blue fluorophores while blocking all emission wavelengths above 510 nm.
- Multi-channel microscopy – Defines a clean blue-cyan detection channel, preventing cross-talk with green or red fluorescence channels.
- Laser line clean-up – Removes broadband background and ASE from 488–505 nm laser sources, delivering a spectrally pure beam below the cut-off.
- Machine vision – Isolates blue-cyan illumination in high-contrast inspection systems where green and longer ambient wavelengths degrade image quality.
- Architectural & stage lighting – Produces a vivid cyan wash from broadband sources with no green spill or warm-tone contamination.
Need a 520 nm shortpass tailored to your optical path? KUPO Optics provides rapid prototyping and volume production to your exact size, shape, and substrate specifications.
FAQ
B19506 FAQ
What is B19506 and what is it used for?
B19506 is a 490 nm Shortpass Filter. The B19506 delivers a blue-pass profile with its 50 % cut-off measured at 485.6 nm. The passband spans 406-482 nm with average transmission exceeding 91 %, peaking at 93.2 % near 471 nm. Common uses include Blue-band excitation filtering, Multispectral imaging, Marine & environmental sensing, and Industrial sorting by color.
What are the key optical specs of B19506?
Key published specs for B19506 include Passband: 414 – 480 nm, 90.1 – 93.2 % T (± 1.6 % ripple); Cut-off (T50): ≈ 486 nm; Edge steepness: ~11 nm (90 → 10 % transition); Blocking: < 0.98 % T above 500 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is B19506 best suited for?
B19506 is commonly used for Blue-band excitation filtering, Multispectral imaging, Marine & environmental sensing, and Industrial sorting by color. Blue-band excitation filtering - Cleans up 470-480 nm LED or laser excitation for GFP and other blue-excited fluorophores by blocking all longer-wavelength ASE.
Can B19506 be customized for size, substrate, or coating requirements?
KUPO lists the construction for B19506 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 substrates.
What should I know about angle of incidence and durability for B19506?
The published angle of incidence for B19506 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
