R2714 Longpass Filter
Enable sharp red channel isolation with minimal transition zone and excellent passband flatness.
- Passband: 629 – 780 nm, 90.5 – 95.4 % T (± 2.5 % ripple)
- Cut-on (T50): ≈ 621 nm
- Edge steepness: ~17 nm (10 → 90 % transition)
- Blocking: < 0.92 % T below 600 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
R2714 Hybrid delivers Passband 629 – 780 nm, 90.5 – 95.4 % T (± 2.5 % ripple), Cut-on (T50) ≈ 621 nm, and Edge steepness ~17 nm (10 → 90 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
mCherry and tdTomato fluorescence imaging, deep red LED filtering, orthogonal red-channel separation, Cy5 detection with minimal IR bleed, and precision color separation in high-resolution microscopy.
Description
The R2714 passes the deep red and near-infrared spectrum with its 50 % cut-on at 621.1 nm. Transmission averages above 94 % from 626 to 780 nm, peaking at 95.4 % near 722 nm. The blocking floor is exceptionally deep at 0.2 % average from 380 to 609 nm, providing OD 2.7+ rejection of the entire visible spectrum from UV through orange. This filter is positioned to isolate the red-NIR window just above the orange-red boundary.
Key Advantages
- 621 nm cut-on for red-NIR pass - T50 % at 621.1 nm isolates the deep-red and NIR spectrum, blocking UV through orange.
- Ultra-deep 0.2 % blocking - Average transmission just 0.2 % from 380 to 609 nm delivers OD 2.7+ rejection.
- 95.4 % peak with > 94 % average - Flat passband across 154 nm of red-to-NIR bandwidth.
- Hard-oxide durability - Ion-assisted sputtered coating withstands thermal cycling, humidity, and aggressive cleaning protocols.
- 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
- Far-red fluorescence collection - Passes Cy5, Alexa 647, and far-red protein emission while blocking all shorter excitation wavelengths.
- Red LED isolation - Passes 625-660 nm red LED emission for machine vision while eliminating scattered ambient light.
- Solar cell characterization - Defines the red-NIR portion of the solar spectrum for band-gap analysis of photovoltaic materials.
- Medical phototherapy monitoring - Passes the therapeutic red-NIR window (625-780 nm) for photobiomodulation dosimetry.
- Covert NIR imaging - Blocks visible light while passing red and NIR for surveillance and driver-assistance systems.
Need the R2714 customized? KUPO Optics provides rapid prototyping and volume production to your specifications.
FAQ
R2714 FAQ
What is R2714 and what is it used for?
R2714 is a 625 nm Longpass Filter. The R2714 passes the deep red and near-infrared spectrum with its 50 % cut-on at 621.1 nm. Transmission averages above 94 % from 626 to 780 nm, peaking at 95.4 % near 722 nm. Common uses include Far-red fluorescence collection, Red LED isolation, Solar cell characterization, and Medical phototherapy monitoring.
What are the key optical specs of R2714?
Key published specs for R2714 include Passband: 629 – 780 nm, 90.5 – 95.4 % T (± 2.5 % ripple); Cut-on (T50): ≈ 621 nm; Edge steepness: ~17 nm (10 → 90 % transition); Blocking: < 0.92 % T below 600 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is R2714 best suited for?
R2714 is commonly used for Far-red fluorescence collection, Red LED isolation, Solar cell characterization, and Medical phototherapy monitoring. Far-red fluorescence collection - Passes Cy5, Alexa 647, and far-red protein emission while blocking all shorter excitation wavelengths.
Can R2714 be customized for size, substrate, or coating requirements?
KUPO lists the construction for R2714 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 R2714?
The published angle of incidence for R2714 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
