B18103 Shortpass Filter

The B18103 passes the ultraviolet and deep-blue spectrum with its 50 % cut-off measured at 459 nm. Transmission averages above 90 % from 385 to 454 nm, peaking at 93.3 % near 423 nm, delivering bright throughput across the violet-to-blue window. Beyond the transition, the filter drives transmission below 1 % by 476 nm and holds it under 0.4 % on average from 476 nm to 780 nm - a clean, deep blocking floor with no significant NIR leakage.

Key Advantages

• Precise 459 nm cut-off – T50 % measured at 459.3 nm with a transition that reaches < 1 % within 17 nm, sharply delineating the blue-pass region.
• High-throughput passband – Average transmission above 90 % across 385-454 nm with a 93.3 % peak, minimizing signal loss for blue-channel applications.
• Extended OD 2+ blocking – Transmission stays below 0.4 % from 476 nm to 780 nm, providing broadband rejection of green through 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 – Cleans up excitation sources for DAPI and Hoechst stains by passing only the blue excitation window and blocking all longer fluorescence wavelengths.
• Color-channel separation – Defines the blue channel in RGB camera systems or multi-channel imaging, with no leakage into green or red.
• Laser line clean-up – Removes ASE and sideband emission from 445-455 nm diode lasers, delivering a spectrally pure beam.
• LED-based machine vision – Isolates blue LED illumination for high-contrast surface inspection where longer wavelengths would reduce feature visibility.
• Architectural & stage lighting – Produces vivid blue washes with zero green or warm-tone spill for precise color design.

Need a 460 nm shortpass tailored to your optical path? KUPO Optics provides rapid prototyping and volume production to your exact size, shape, and substrate specifications.