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Measurement of the time between the start of the laser pulse and the disruption of the irradiated surface provides information not available in traditional damage measurements. The importance of the rate of energy input versus the total energy deposited may be studied by varying the pulse energy and measuring the time at which damage is initiated. If the diagnostics are of adequate sensitivity, a damage threshold fluence can be assigned to each damage event and the fluence distribution of the defect population can be measured.
I will discuss the test configuration and diagnostics for both transmitting and reflecting coatings. Preliminary data at 248 nm with a 23 ns pulse length will be presented.
defect population, diagnostics, optical coatings, time dependence of damage
Los Alamos National Laboratory, Los Alamos, NM