O77809 Longpass Filter
Collect red light and infrared while rejecting the entire visible spectrum below 593 nm with depth.
- Passband: 593 – 780 nm, 90.6 – 95.1 % T (± 2.2 % ripple)
- Cut-on (T50): ≈ 575 nm
- Edge steepness: ~37 nm (10 → 90 % transition)
- Blocking: < 0.96 % T below 527 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
O77809 Hybrid delivers Passband 593 – 780 nm, 90.6 – 95.1 % T (± 2.2 % ripple), Cut-on (T50) ≈ 575 nm, and Edge steepness ~37 nm (10 → 90 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Deep red and far-red fluorescence imaging, Cy5 detection, infrared camera preparation, red-channel separation in high-throughput microscopy, and thermal pre-filtering applications.
Description
The O77809 cuts on at 575.1 nm, transmitting the warm-visible and near-infrared spectrum from approximately 586 nm to 780 nm with average transmission above 93 %. The passband peaks at 95.1 % near 732 nm. The blocking region is thorough, holding below 1 % from 380 to 548 nm and transitioning sharply from 549 to 585 nm. This filter lands right at the yellow midpoint, isolating everything from warm yellow through deep NIR.
Key Advantages
- 575 nm cut-on at mid-yellow - T50 % at 575.1 nm positions the transition in the yellow band, providing a natural warm/cool spectral divide.
- 93.6 % average passband - Flat response from 586 to 780 nm with a 95.1 % peak, delivering consistent throughput across 195 nm.
- Deep UV-green blocking - Transmission averages 0.4 % from 380 to 548 nm, rejecting the entire cool-visible spectrum.
- Hard-oxide durability - Ion-assisted sputtered coating resists heat, humidity, solvents, and repeated cleaning without spectral drift.
- 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
- 561 nm laser emission pass - Blocks 561 nm laser excitation light while passing all fluorescence emission above 575 nm in confocal microscopy.
- Warm-tone color separation - Defines the yellow-orange-red channel in multi-band imaging systems for display or material analysis.
- Combustion analysis - Passes sodium, potassium, and other metallic emission lines in flame spectroscopy while blocking blue flame background.
- Agricultural NIR imaging - Captures red-edge and NIR reflectance for crop health monitoring while rejecting green-band photosynthetic reflectance.
- Lighting design - Produces warm amber-to-red washes with no residual green or blue coloring for stage and architectural applications.
KUPO Optics manufactures the O77809 to your exact specifications - rapid prototyping and volume production available.
FAQ
O77809 FAQ
What is O77809 and what is it used for?
O77809 is a 572 nm Longpass Filter. The O77809 cuts on at 575.1 nm, transmitting the warm-visible and near-infrared spectrum from approximately 586 nm to 780 nm with average transmission above 93 %. The passband peaks at 95.1 % near 732 nm. Common uses include 561 nm laser emission pass, Warm-tone color separation, Combustion analysis, and Agricultural NIR imaging.
What are the key optical specs of O77809?
Key published specs for O77809 include Passband: 593 – 780 nm, 90.6 – 95.1 % T (± 2.2 % ripple); Cut-on (T50): ≈ 575 nm; Edge steepness: ~37 nm (10 → 90 % transition); Blocking: < 0.96 % T below 527 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is O77809 best suited for?
O77809 is commonly used for 561 nm laser emission pass, Warm-tone color separation, Combustion analysis, and Agricultural NIR imaging. 561 nm laser emission pass - Blocks 561 nm laser excitation light while passing all fluorescence emission above 575 nm in confocal microscopy.
Can O77809 be customized for size, substrate, or coating requirements?
KUPO lists the construction for O77809 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 substrates.
What should I know about angle of incidence and durability for O77809?
The published angle of incidence for O77809 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
