S-on-1 Test

S-on-1 test procedure is most frequently used to qualify optics in terms of laser damage threshold.

Most optics is intended to be used for multiple laser shots irradiation under different fluencies. Up to now S-on-1 has been the most detailed laser damage testing procedure. It is able to evaluate laser damage threshold changes for different irradiation conditions. In order to perform S-on-1 procedure testing the surface area is divided into a matrix of sites, which are well separated in space. A constant number of sites is exposed under S multiple laser shots with the same fluency. The number of pulses can vary on the demand requirements for different applications. Typically 1000 pulses are used for one site irradiation for low repetition rate regime (1-100Hz) and for high repetition rate (>1kHz) the number of consecutive pulses for one site could be as high as 10000-on-1. Then the fluency is increased and sequence is repeated for other sites. If the optical element is damaged in the middle of the laser pulse set, the exposure is stopped to prevent further destruction of the sample. The number of pulses passed before the damage occurs is recorded and used to evaluate LIDT dependence on number of applied pulses. S on 1 testing procedure also benefits in:

  • considering accumulation and incubation effects – this helps to predict the aging of optics,
  • considering defect distribution on the sample,
  • including 1-on-1 data – no need to run additional tests,
  • considers effects of repetition rate.


It is recommended to perform the procedure whenever the accurate LIDT value is needed. Developers of optical systems, optic reselling companies and especially optics manufacturing and development institutions are highly advised to run S on 1 test in order to improve and guarantee the quality of their products. Our service provides S-on-1 test in a very broad range of experimental conditions. Also to benefit our customers we offer detailed measurement reports containing easy to understand statistical data.

If you are interested in our laser damage threshold testing, please fill out our laser damage threshold testing inquiry form.




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