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

325nm 50mm Dia., High Performance Longpass Filter

High Performance OD 4.0 Longpass Filters

Stock #34-297 3-5 days
- +
Qty 1-5
Qty 6+
Volume Pricing
Request Quote
Get Product Downloads
Diameter (mm):
50.00 +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 - 315
Surface Quality:
Thickness (mm):
Thickness Tolerance (mm):
Transmission (%):
Transmission Wavelength (nm):
333 - 1600
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
Coating Specification:
Surface 1: Hard Dielectric Sputtered
Surface 2: AR Coated
Wavelength Range (nm):
200 - 1600

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 235:

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.