ISO 1-on-1 LIDT test (21254-1,2)

Single-shot technique for determination of “intrinsic” laser-induced damage threshold of coatings. Also suited to optimize optics manufacturing processes featuring high defect densities (such as glass polishing).

1-on-1 test explained:

Use this test for:

  • a feedback when optimizing polishing process and characterizing high defect densities;
  • investigation of intrinsic material properties;
  • screening experiments;
  • reference, when quantifying “fatigue” or “conditioning” effects;

Test description

The entrance surface of an optical element is divided into a matrix of test sites. Each test site is then exposed to a single laser pulse using fixed laser irradiation level (peak fluence). Distinct irradiation levels are used for individual test sites. After exposure, the status of all test sites was inspected using offline microscopy. Collected damage statistics are interpreted to calculate damage probability versus applied laser irradiation level. Using this data set laser-induced damage threshold (LIDT) is calculated as the maximum applied laser irradiation level featuring zero damage probability. In the case of CW irradiation, the 1(Time)-on-1 test can be repeated using different pulse duration.

Known limitations and risks:

  • 1-on-1 LIDT might be overestimated
    • when optical element features very low defect density, rare defects will be simply missed by small laser beam (use raster scan LIDT tests instead)
    • Ageing, fatigue or incubation effects are not considered;
  • Annealing of neighboring test sites is possible at the CW regime;

Most popular test parameters for this test

Wavelength Pulse duration(1) Pulses per test site Interested?
1070 nm 30 s 1 ORDER
355 nm 5 ns 1 ORDER
Custom Check all availability or configure your own at

(1) effective pulse duration measured at Full Width Half Maximum


Check out all available testing capabilities. Identify your system in our “Available testing conditions” table.

Test bundles and packages

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  • Optics Characterization Bundle for CW regime at 1070 nm
    The testing package consists of multiple tests, which are carefully selected to address optics characterization issues at the CW regime.
    Find out more
  • Lifetime + Certification Bundle for Industrial Grade fs-ps Laser Optics
    The package consists of several tests carefully selected to address optics certification for critical applications.
    Find out more

more tools
and useful information

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  • Testing conditions

    Check out all available laser damage testing conditions (wavelengths, pulse regimes, environments, and more).
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  • Laser Damage infobase

    Check out a useful glossary of terms and simple explanations related to the main topics of laser damage terminology.
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  • Online Fluence calculator

    Check out a calculator equipped with laser-related calculus that is frequently required in practice: such as laser fluence.
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  • Downloads and docs

    Here you can download all information about laser damage testing available at Lidaris.
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  • New client guide

    Here you will find usefull guidlines and suggestions for everyone, who is new the laser damage field.
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  • Orders FAQ

    Fast way to find out about test samples prepration, handling, and shipping
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Feel free to let us know if you have any concerns. We can always help you with choosing the right solution for your specific needs.