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Talbot array illuminator for single-shot measurements of laser-induced-damage thresholds of thin-film coatings
Authors:Siegel C  Loewenthal F  Balmer J E  Weber H P
Affiliation:Institute of Physics, Sidlerstrasse 5, Bern, Switzerland.
Abstract:A highly efficient Talbot array illuminator for single-shot, laser-induced-damage test measurements of optical thin-film coatings is proposed. With a periodic binary phase grating, a laser beam is transformed into an ensemble of Gaussian-like spots, which are known as the Fresnel image of the grating. For this purpose hexagonal phase gratings were fabricated and analyzed. With a peak fluence distribution of ~1 order of magnitude, the damage threshold of thin films can be deduced by use of the data from only a single shot.
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