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
Original Manuscript: July 26, 1999
Revised Manuscript: December 22, 1999
Published: April 1, 2000
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)