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1.05μm, 25mm Diameter, Infrared Longpass Filter

Infrared (IR) Longpass Filters

Stock #68-651 10 to 12 days
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Diameter (mm):
25.00 +0.0/-0.1
Optical Density OD (Average):
Cut-On Wavelength (nm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Silicon (Si)
Operating Temperature (°C):
-62 to +71
Traditional Coated
Surface Quality:
Thickness (mm):
Thickness Tolerance (mm):
Transmission (%):
Transmission Wavelength (nm):
1100 - 2100
Transmission Wavelength (μm):
1.10 - 2.10
Longpass Filter
Blocking Wavelength Range (nm):
200 - 1050
Parallelism (arcmin):
Clear Aperture (%):
Slope Factor (%):
Cut-On Wavelength (μm):
1.05 ±0.04
Transmission at cut-on wavelength is 5% of peak transmission.
Surface Flatness (P-V):
3 - 5λ

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 235:

Product Family Description

  • Coated on Silicon or Germanium Substrates
  • Ideal for Isolating Broad Spectral Regions
  • Durable, First-Surface Coatings

Infrared (IR) Longpass Filters provide a sharp cut-off below a particular wavelength. Often used for order sorting, they isolate broad regions of the spectrum, simultaneously providing high transmission of desired energy, and deep rejection of unwanted energy. These filters are constructed of hard, durable first-surface dielectric coatings on optical-quality IR-transmitting substrates. Infrared (IR) Longpass Filters are able to withstand normal cleaning and handling associated with any high-quality optical component because of their make-up. These filters are particularly useful for FTIR spectroscopy and Thermal Imaging Applications. For custom sizes and coating requirements, please contact our Sales Department.

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