Laser 2000

811/81 Avant™ Bandpass Filter, 25 mm

Semrock Logo

For optimal filter set performance, pair this emitter with AF01-720/75 and AF764-Di01, which have been optimized for Cy7™, Alexa Fluor 750, and other key fluorophores. Precise edge placement of the steep spectral edges combined with deep complementary blocking maximize fluorophore performance compared to standard exciter and emitter pairs.

Note on spectral plots:
In the past, each shipment has included a spectral plot for every filter and every lot code in the shipment. In an effort to be more eco-friendly, we will no longer be including these plots with each shipment. If you require spectral plot data, please see here for more information.

Optical Specifications
Transmission BandTavg > 93% 770.5 – 851.5 nm
Transmission Wavelength811 nm
FWHM Bandwidth88.5 nm
Blocking BandODavg > 5 200 – 275 nm (Design specification – measurements are noise-floor limited)
ODavg > 6 275 – 668 nm
ODavg > 10 668 – 758 nm (Design specification – measurements are noise-floor limited)
ODabs > 3.5 @ 764 nm
ODavg > 2 871 – 1100 nm

General Specifications
Angle of Incidence0 ± 5 °
Cone Half-angle7 °
Optical Damage RatingTesting has proven to show no signs of degradation when exposed to at least 6.0 W of power from an unfiltered xenon arc lamp over a 25 mm diameter (corresponding to 1.2 W/cm²) for over 500 hrs.

Physical Specifications (for standard parts - please contact us for custom sizes)
Mounted / UnmountedMounted
Size25 x 3.5 mm
Transverse Dimensions, Diameter25 mm
Transverse Tolerance, Mounted+ 0.0 / - 0.1 mm
Substrate Thickness Tolerance, Unmounted± 0.1 mm
Filter Thickness, Mounted3.5 mm
Filter Thickness Tolerance, Mounted± 0.1 mm
Clear Aperture≥ 21 mm
Surface Quality (Scratch-Dig)60-40
Substrate Thickness2.0 mm
Substrate TypeLow-autofluorescence optical quality glass
OrientationArrow on ring indicates preferred direction of propagation of light


  • Size: 25 x 3.5 mm


Loading chart data...

Optical Density

Loading chart data...

Semrock Spectral Plot Info

Request a Demo


Ask the Expert

If you’re interested in the products shown here, or have questions about something you can’t find on our website, please get in touch through the form below.

Our knowledgeable sales team will be happy to help. We can normally source exactly what you need, or work with you to come up with custom solutions.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to the Photonics team.