B0611 Dual-Band Filter

The B0611 passes the blue-green spectrum with its 50 % cut-off measured at 561 nm. Transmission averages above 90 % from 420 to 550 nm, peaking at 93.4 % near 485 nm, providing wide coverage across the blue-to-green window. Past the cut-off, the filter reduces transmission to below 1 % by 578 nm and holds sub-0.5 % blocking on average from 578 nm to 780 nm – a clean, deep rejection floor with minimal NIR leakage.

Key Advantages

• Precise 561 nm cut-off – T50 % measured at 561.3 nm with a transition that drops to < 1 % within 17 nm, cleanly blocking the 568–575 nm yellow-green region while passing all blue and green wavelengths.
• High-throughput passband – Average transmission above 90 % across 420–550 nm with a 93.4 % peak, preserving maximum signal across the full blue-to-green range.
• Broadband blocking – Sub-0.5 % average transmission from 578 nm to 780 nm, ensuring reliable rejection of yellow, 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 the full excitation band for GFP and YFP while blocking yellow-orange emission wavelengths above 560 nm.
• Multi-channel microscopy – Defines a blue-to-green detection channel, preventing cross-talk with orange or red fluorescence channels.
• Laser line clean-up – Removes ASE and broadband background from 532–555 nm laser sources, delivering spectrally pure illumination below the 560 nm edge.
• Machine vision – Isolates blue-green LED illumination in automated inspection systems requiring rejection of yellow-orange and red ambient light.
• Architectural & stage lighting – Produces a vivid green wash from broadband sources with no yellow, amber, or warm-tone contamination.

Need a 570 nm shortpass tailored to your optical path? KUPO Optics provides rapid prototyping and volume production to your exact size, shape, and substrate specifications.