25mm Dia., 488nm Laser Line Longpass Filter

Laser Line Longpass Filters

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Diameter (mm):
25.00 +0.0/-0.1
Angle of Incidence (°):
0 ±2
Bandwidth (nm):
OD 6 Blocking Wavelength Range (nm):
394 - 488
Optical Density OD (Average):
Clear Aperture CA (mm):
Design Wavelength DWL (nm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica (Corning 7980)
Hard Coated
Surface Quality:
Thickness Tolerance (mm):
Transmission (%):
Transmission Wavelength (nm):
494.3 - 1100.8
Longpass Filter
Edge Steepness (nm):
Transition Width (nm):
Clear Aperture (%):
Environmental: MIL-STD-810F, Physical: MIL-C-48497A
Temperature Dependence (ppm/°C):
Angle Tuning Range, for 0 - 8° Shift:
-0.3% of Laser Wavelength
Mount Thickness (mm):
Bandwidth (nm): >600
Laser Blocking Wavelength (nm):
Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
0.5 J/cm2 @ 266nm, 10ns, 10Hz
1 J/cm2 @ 532nm, 10ns, 10Hz

Regulatory Compliance

RoHS 2015:
Reach 209:
Certificate of Conformance:

Product Family Description

  • Up to 93% Transmission to Detect Weak Signals
  • Deep > OD 6 Blocking for Maximum Laser Rejection
  • Ideal for Raman Spectroscopy, Confocal Microscopy, and Biotech Instrumentation
  • Unrivaled Performance and Lifetime

Our Laser Line Longpass filters offer unprecedented performance in longpass laser edge filter applications. The steep edges (measured from an optical density of 6.0 to a transmission of 50%) make it possible to measure even the smallest Raman shifts, making these filters a superior alternative to costly holographic notch filters for Stokes Raman scattering measurements. Compared to notch filters, these edge filters offer better transmission, higher laser line blocking, and steeper edges, permitting measurement of Raman signals extremely close to the laser line. The large bandwidths and exceptional transmission permit these filters to be used in even the most demanding imaging applications.