B71305 Shortpass Filter
Wide blue-to-cyan transmission for versatile multi-wavelength imaging and detection.
- Passband: 402 – 469 nm, 90.2 – 93.6 % T (± 1.7 % ripple)
- Cut-off (T50): ≈ 479 nm
- Edge steepness: ~23 nm (90 → 10 % transition)
- Blocking: < 0.99 % T above 516 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
B71305 Hybrid delivers Passband 402 – 469 nm, 90.2 – 93.6 % T (± 1.7 % ripple), Cut-off (T50) ≈ 479 nm, and Edge steepness ~23 nm (90 → 10 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Multi-colour fluorescence, wide-band blue excitation, UV-visible spectrometers, analytical instruments.
Description
The B71305 passes the deep-blue and blue-green spectrum with its 50 % cut-off measured at 501 nm. Transmission averages above 90 % from 395 to 491 nm, peaking at 93.1 % near 450 nm, delivering broad coverage across the violet-to-cyan window. Beyond the transition edge, the filter suppresses transmission to below 1 % by 516 nm and holds sub-0.5 % blocking on average from 516 nm to 780 nm – a clean, wide rejection floor with minimal NIR leakage.
Key Advantages
- Precise 501 nm cut-off – T50 % measured at 500.6 nm with a transition that drops to < 1 % within 15 nm, sharply isolating the blue-cyan passband from green wavelengths.
- High-throughput passband – Average transmission above 90 % across 395–491 nm with a 93.1 % peak, preserving maximum signal across the violet-to-cyan range.
- Broadband blocking – Sub-0.5 % average transmission from 516 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, Pacific Cyan, and similar blue-shifted fluorophores while blocking all emission wavelengths above 500 nm.
- Multi-channel microscopy – Defines a wide violet-to-cyan channel in multi-color imaging setups, preventing cross-talk with green or red detection channels.
- Laser line clean-up – Removes ASE and sideband emission from 473–488 nm laser sources, delivering spectrally pure illumination up to the 500 nm edge.
- Machine vision – Isolates blue-cyan LED illumination in automated inspection systems that require rejection of green and warm ambient light.
- Architectural & stage lighting – Produces a clean aquamarine wash from broadband sources with no green contamination.
Need a 510 nm shortpass tailored to your optical path? KUPO Optics provides rapid prototyping and volume production to your exact size, shape, and substrate specifications.
FAQ
B71305 FAQ
What is B71305 and what is it used for?
B71305 is a 480 nm Shortpass Filter. The B71305 transmits the violet-through-blue spectrum with its 50 % cut-off measured at 478.7 nm. Average transmission exceeds 90 % across the 386-472 nm passband, peaking at 93.6 % near 440 nm. Common uses include Fluorescence excitation clean-up, RGB color separation, Semiconductor photoluminescence, and Aquatic & marine sensing.
What are the key optical specs of B71305?
Key published specs for B71305 include Passband: 402 – 469 nm, 90.2 – 93.6 % T (± 1.7 % ripple); Cut-off (T50): ≈ 479 nm; Edge steepness: ~23 nm (90 → 10 % transition); Blocking: < 0.99 % T above 516 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is B71305 best suited for?
B71305 is commonly used for Fluorescence excitation clean-up, RGB color separation, Semiconductor photoluminescence, and Aquatic & marine sensing. Fluorescence excitation clean-up - Placed after a broadband source, passes only violet-blue excitation energy while ensuring zero bleed into emission detection bands.
Can B71305 be customized for size, substrate, or coating requirements?
KUPO lists the construction for B71305 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 B71305?
The published angle of incidence for B71305 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
