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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

850nm 12.5mm Dia., High Performance Longpass Filter

High Performance OD 4.0 Longpass Filters

Stock #66-228 In Stock
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Diameter (mm):
12.50 +0.0/-0.2
Angle of Incidence (°):
Optical Density OD (Average):
Cut-On Wavelength (nm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica (Corning 7980)
Hard Coated
Rejection Wavelength (nm):
200 - 835
Surface Quality:
Thickness (mm):
Thickness Tolerance (mm):
Transmission (%):
Transmission Wavelength (nm):
865 - 1650
Longpass Filter
Clear Aperture (%):
Transmitted Wavefront, RMS:
≤λ/4 @ 633nm (prior to coating)
Cut-On Tolerance (%):
Slope Factor (%):
Environmental Durability:
Humidity per MIL-STD-810H, Section 507.6
Temperature per MIL-STD-810H, Section 501.7 and 502.7
Physical Durability:
Adhesion per MIL-PRF-13830B, Section C.4.5.12
Moderate abrasion per MIL-PRF-13830B, Section C.4.5.11
Cleaning per MIL-C-48497A Section
Arrow on part indicates filter coated surface.
Coating Specification:
Surface 1: Hard Dielectric Sputtered
Surface 2: AR Coated
Wavelength Range (nm):
200 - 1650

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 240:

Product Family Description

TECHSPEC® High Performance OD 4.0 Longpass Filters feature high transmission in the pass band combined with superior blocking in the rejection band. Due to a rejection band optical density of 4.0 combined with >91% in the pass band, these filters are ideal for a wide variety of applications. TECHSPEC® High Performance OD 4.0 Longpass Filters are hard coated, with a hard dielectric sputtered as the first surface and AR coating as the second. Eliminate stray light by creating custom bandpass filters when combined with TECHSPEC® High Performance Shortpass Filters.

Note: These filters are optimized for high spectral performance rather than high Laser Induced Damage Thresholds (LIDT). A typical LIDT for these filters is 1 J/cm2 @ 532nm, 10ns. Please contact us if you require a filter with a higher LIDT value.

 TECHSPEC® Rotating Filter Wheel can be used for applications requiring a variety of filters.