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Long Pass Optical Filters

Sofradir IR Viewers are nearing the end life as a product line.
We can offer an alternative though, so please contact us!


Long Pass Filters


These optical filters are perfect for many imaging applications that benefit from blocking the transmission of short-wave electromagnetic radiation while allowing long-wave to pass through.


Features

  • Highly transmissive in near-infrared band
  • Blocks short wavelengths from UV through visible
  • Sharp cut-on with 40nm transition from 1% to first peak (typical)


Specifications


Diameter
25.4mm +0.0/-0.25mm
Clear Aperture
20mm
Thickness
3-5mm (nominal)
Surface Finish
Commercial Polish
Blocking Range
Brange to 85% of cut-on
wavelength, 0.1%
transmittance
Rise from 1% T
to First Peak
40mm typical


λc = Cut-on wavelength at which transmission is 50% Tpeak
Tpeak = Typical Average Transmission in passband
Prange = Passband spectral range
Brange = Blocking spectral range


Ordering Information


Item
Discription
λc=700nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=750nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=800nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=850nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=900nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=950nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=1,000nm ±10nm, Tpeak=75%, Prange to 2,500nm, Brange to 100nm
λc=1,100nm ±10nm, Tpeak=65%, Prange to 2,500nm, Brange to 100nm
λc=1,200nm ±10nm, Tpeak=65%, Prange to 2,500nm, Brange to 100nm
λc=1,300nm ±10nm, Tpeak=65%, Prange to 2,500nm, Brange to 100nm
λc=1,400nm ±10nm, Tpeak=65%, Prange to 2,500nm, Brange to 100nm
λc=1,500nm ±10nm, Tpeak=65%, Prange to 2,500nm, Brange to 100nm
λc=2,000nm ±50nm, Tpeak=70%, Prange to 4,000nm, Brange to 100nm
λc=3,000nm ±50nm, Tpeak=70%, Prange to 6,000nm, Brange to 100nm
λc=4,000nm ±100nm, Tpeak=70%, Prange to 5,000nm, Brange to 100nm

Requires a filter holder for use with the 7215 or 7290A series.
Please order:
- F25 Filter Holder for 7215 series ElectroViewers
or
- G25 Filter Slide for 7290 series MicronViewers