LASER INSTALLATION FOR DAMAGE THRESHOLD MEASUREMENT OF OPTICAL ITEMS AT THE 2.87 μm WAVELENGTH
A.A. Sirotkin, V.R. Sorochenko
A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russia
Keywords: laser damage threshold, scanning knife method, lens focal plane, radiation energy density, radiation intensity
Abstract
An installation based on a Q-switched Cr:Yb:Ho:YSGG (λ = 2.87 μm) 15 mJ, 40 ns laser is described. The installation is intended for laser damage threshold measurements of 3-μm range optical items and other laser -matter interaction experiments. The peculiarities of laser caustic measurements near the focal plane of an ƒ = 50 mm lens with the aid of the scanning knife method for different temporal structures of the radiation pulse are discussed. At the laser beam diameter of »160 μm, the radiation energy density on the surface of the optical item under investigation can be smoothly varied in the range from 1 to 52 J/cm2.
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