B8507 Dual-Band Filter

The B8507 passes the blue-green and cyan spectrum with its 50 % cut-off measured at 523 nm. Transmission averages above 90 % from 405 to 512 nm, peaking at 93.2 % near 465 nm, delivering broad throughput across the blue-to-green window. Past the cut-off, the filter reduces transmission to below 1 % by 539 nm and holds sub-0.5 % blocking on average from 539 nm to 780 nm – a clean, deep rejection floor with minimal NIR leakage.

Key Advantages

• Precise 523 nm cut-off – T50 % measured at 522.7 nm with a transition that drops to < 1 % within 16 nm, cleanly blocking the 532 nm Nd:YAG line and all longer wavelengths.
• High-throughput passband – Average transmission above 90 % across 405–512 nm with a 93.2 % peak, preserving maximum signal across the full blue-to-cyan range.
• Broadband blocking – Sub-0.5 % average transmission from 539 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

• 532 nm laser blocking – Placed in the detection path to suppress Nd:YAG 532 nm pump light while freely transmitting blue and cyan signal wavelengths.
• Fluorescence excitation filtering – Cleans up excitation sources for GFP and FITC by passing the full blue excitation band while blocking the green emission region.
• Raman spectroscopy – Used as an edge filter in 488 nm or 514 nm Raman systems to reject the laser line while transmitting Stokes-shifted signal up to 520 nm.
• Machine vision – Isolates blue-cyan LED illumination in automated inspection systems requiring rejection of green and longer ambient wavelengths.
• Architectural & stage lighting – Produces a clean blue-green wash from broadband sources, blocking yellow and warm-tone spill.

Need a 532 nm shortpass tailored to your optical path? KUPO Optics provides rapid prototyping and volume production to your exact size, shape, and substrate specifications.