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We're happy to announce a new tool to help with this common question. Semrock's Laser Damage Threshold (LDT) Calculator is available in the Technical Support section of our website. The LDT Calculator is for reference and guidance purposes only, for customers using a specific laser with a Semrock filter. Results compare the laser fluence with the filter laser damage threshold for that product family to determine if damage risk is not probable, possible, or expected.

Laser damage to optical filters depends on many factors, including:

  • Material properties: absorption coefficient, specific heat, melting temp
  • Defects that cause scattering and concentrated electric field effects
  • Geometric properties of the sample: thickness, homogeneity, surface morphology, etc.
  • Laser beam properties

More specific information is available in our techinical note and in each product's Optical Damage Rating specifications.