O1911 Longpass Filter
Isolate far-red and infrared channels from all visible-range interference with wide blocking margin.
- Passband: 607 – 780 nm, 90.2 – 95.7 % T (± 2.8 % ripple)
- Cut-on (T50): ≈ 592 nm
- Edge steepness: ~34 nm (10 → 90 % transition)
- Blocking: < 0.99 % T below 544 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
O1911 Hybrid delivers Passband 607 – 780 nm, 90.2 – 95.7 % T (± 2.8 % ripple), Cut-on (T50) ≈ 592 nm, and Edge steepness ~34 nm (10 → 90 % transition).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
Far-red and Cy5 fluorescence microscopy, infrared camera systems, deep color separation, near-IR photometry, and multi-band thermal imaging with visible-spectrum rejection.
Description
O1911 removes almost every photon below about 570 nm and passes a smooth, colour-neutral band from rich orange out to the deep red. Measured transmission stays under 1 % through roughly 555 nm, crosses 50 % near 585 nm, clears 90 % by ~600 nm, and holds between 92 – 95 % up to at least 775 nm with spectral ripple contained to ±2 %. It is a straightforward way to warm LED or laser sources, isolate orange-to-red fluorescence, or strip cyan glare from machine-vision images.
Key advantages
-
Consistent cyan cutoff – 50 % cut-on ≈ 585 nm; < 1 % T maintained below ~555 nm to minimise blue/green leakage.
-
High, flat passband – 92 – 95 % T from ~600 nm to 775 nm keeps luminance and hue stable.
-
Hard-oxide durability – Ion-assisted layers tolerate heat, humidity, solvents, and repeated cleanings.
-
Format flexibility – Round, square, or free-form blanks from 5 mm to 450 mm, 0.21 – 3.8 mm thick, on Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG glass.
Typical applications
-
LED colour tuning – Remove cool spikes in white or RGB fixtures to create warm, amber-rich ambience.
-
Fluorescence emission – Collect orange/red probes (Cy3, mCherry, Texas Red) while blocking cyan excitation lines.
-
Machine vision – Strip cyan reflections from shiny parts while keeping the red channel bright for defect detection.
-
Photography & cinema lighting – Warm daylight LED panels toward a tungsten look without gels.
-
AR / HUD optics – Inject orange-to-red graphics cleanly, with negligible blue-green bleed toward the viewer.
Need rapid prototypes or high-volume supply? O1911 filters can be coated, diced, and shipped to your exact specifications—fast.
FAQ
O1911 FAQ
What is O1911 and what is it used for?
O1911 is a 590 nm Longpass Filter. The O1911 blocks UV through the yellow-green band with its 50 % cut-on at 592 nm, then transmits from orange through the near-infrared with average throughput exceeding 94 %. The passband runs from 602 to 780 nm with a peak of 95.7 % near 762 nm. Common uses include Orange-red emission filtering, Atmospheric sodium rejection, LED warm-tone isolation, and Thermal imaging prefilter.
What are the key optical specs of O1911?
Key published specs for O1911 include Passband: 607 – 780 nm, 90.2 – 95.7 % T (± 2.8 % ripple); Cut-on (T50): ≈ 592 nm; Edge steepness: ~34 nm (10 → 90 % transition); Blocking: < 0.99 % T below 544 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.
What applications is O1911 best suited for?
O1911 is commonly used for Orange-red emission filtering, Atmospheric sodium rejection, LED warm-tone isolation, and Thermal imaging prefilter. Orange-red emission filtering - Passes TRITC, Texas Red, and Cy3.5 emission while blocking 532/561 nm laser excitation and shorter wavelengths.
Can O1911 be customized for size, substrate, or coating requirements?
KUPO lists the construction for O1911 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 O1911?
The published angle of incidence for O1911 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
