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.
© 2000 Optical Society of America
Christoph Siegel, Frank Loewenthal, Jürg E. Balmer, and Heinz P. Weber, "Talbot Array Illuminator for Single-Shot Measurements of Laser-Induced-Damage Thresholds of Thin-Film Coatings," Appl. Opt. 39, 1493-1499 (2000)