Y76704 Longpass Filter
Capture yellow-green and all longer wavelengths with precision edge control and minimal transition ripple.
- Passband: 534 – 780 nm, 90.9 – 95.8 % T (± 2.4 % ripple)
- Cut-on (T50): ≈ 522 nm
- Edge steepness: ~27 nm (10 → 90 % transition)
- Blocking: < 0.91 % T below 485 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
Y76704 Hybrid delivers Passband 534 – 780 nm, 90.9 – 95.8 % T (± 2.4 % ripple), Cut-on (T50) ≈ 522 nm, and Edge steepness ~27 nm (10 → 90 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Daylight-to-tungsten color correction, YFP/RFP fluorescence collection, removal of blue scatter in phase-contrast microscopy, and multi-spectral imaging in botanical and agricultural applications.
Description
The Y76704 passes green through near-infrared with its 50 % cut-on measured at 521.9 nm. Transmission peaks at 95.8 % near 543 nm and averages above 94 % from 531 to 780 nm - a broad, flat passband spanning 250 nm. The blocking region holds below 1 % from 380 to 501 nm, rejecting the entire UV, violet, and blue spectrum. This filter sits right at the green midpoint, making it a versatile choice for warm-visible and NIR applications.
Key Advantages
- 522 nm green-onset cut-on - T50 % at 521.9 nm captures the full green-through-NIR spectrum while blocking all shorter wavelengths.
- 95.8 % peak near 543 nm - Passband peaks early in the green band and stays above 94 % average across 250 nm of bandwidth.
- OD 2+ UV-blue blocking - Average transmission 0.4 % from 380 to 501 nm provides thorough rejection of UV and blue.
- Hard-oxide durability - Ion-assisted sputtered coating survives thermal stress, humidity, solvents, and repeated cleaning.
- 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 barrier filtering - Blocks 488 nm and 514 nm laser excitation while passing green emission peaks and longer-wavelength fluorophores.
- NDVI & agricultural imaging - Captures green, red-edge, and NIR bands for vegetation health assessment in drone and satellite payloads.
- Color-channel isolation - Defines the warm half of the visible spectrum in two-channel imaging systems for display or material analysis.
- Automotive & traffic sensing - Passes green traffic signals and warm-wavelength information while blocking blue and violet glare.
- Stage lighting effects - Strips blue and violet from white sources to produce warm green-to-red washes for theatrical design.
Whether you need prototypes in days or production volumes on schedule, KUPO Optics delivers the Y76704 to your exact specifications.
FAQ
Y76704 FAQ
What is Y76704 and what is it used for?
Y76704 is a 520 nm Longpass Filter. The Y76704 passes green through near-infrared with its 50 % cut-on measured at 521.9 nm. Transmission peaks at 95.8 % near 543 nm and averages above 94 % from 531 to 780 nm. Common uses include Fluorescence barrier filtering, NDVI & agricultural imaging, Color-channel isolation, and Automotive & traffic sensing.
What are the key optical specs of Y76704?
Key published specs for Y76704 include Passband: 534 – 780 nm, 90.9 – 95.8 % T (± 2.4 % ripple); Cut-on (T50): ≈ 522 nm; Edge steepness: ~27 nm (10 → 90 % transition); Blocking: < 0.91 % T below 485 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is Y76704 best suited for?
Y76704 is commonly used for Fluorescence barrier filtering, NDVI & agricultural imaging, Color-channel isolation, and Automotive & traffic sensing. Fluorescence barrier filtering - Blocks 488 nm and 514 nm laser excitation while passing green emission peaks and longer-wavelength fluorophores.
Can Y76704 be customized for size, substrate, or coating requirements?
KUPO lists the construction for Y76704 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. 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 Y76704?
The published angle of incidence for Y76704 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
